49 C.F.R. Subpart D—Maintenance, Inspection, and Testing
Title 49 - Transportation
Plans required for proper maintenance and testing shall be kept at each highway-rail grade crossing warning system location. Plans shall be legible and correct. All control circuits that affect the safe operation of a highway-rail grade crossing warning system shall operate on the fail-safe principle. Operating characteristics of electromagnetic, electronic, or electrical apparatus of each highway-rail crossing warning system shall be maintained in accordance with the limits within which the system is designed to operate. (a) When any essential component of a highway-rail grade crossing warning system fails to perform its intended function, the cause shall be determined and the faulty component adjusted, repaired, or replaced without undue delay. (b) Until repair of an essential component is completed, a railroad shall take appropriate action under §234.105, Activation failure, §234.106, Partial activation, or §234.107, False activation, of this part. (a) The normal functioning of any system shall not be interfered with in testing or otherwise without first taking measures to provide for safety of highway traffic that depends on normal functioning of such system. (b) Interference includes, but is not limited to: (1) Trains, locomotives or other railroad equipment standing within the system's approach circuit, other than normal train movements or switching operations, where the warning system is not designed to accommodate those activities. (2) Not providing alternative methods of maintaining safety for the highway user while testing or performing work on the warning systems or on track and other railroad systems or structures which may affect the integrity of the warning system. Highway-rail grade crossing warning system apparatus shall be secured against unauthorized entry. Each circuit that affects the proper functioning of a highway-rail grade crossing warning system shall be kept free of any ground or combination of grounds that will permit a current flow of 75 percent or more of the release value of any relay or electromagnetic device in the circuit. This requirement does not apply to: circuits that include track rail; alternating current power distribution circuits that are grounded in the interest of safety; and common return wires of grounded common return single break circuits. A standby source of power shall be provided with sufficient capacity to operate the warning system for a reasonable length of time during a period of primary power interruption. The designated capacity shall be specified on the plans required by §234.201 of this part. [66 FR 49560, Sept. 28, 2001] (a) Each flashing light unit shall be properly positioned and aligned and shall be visible to a highway user approaching the crossing. (b) Each flashing light unit shall be maintained to prevent dust and moisture from entering the interior of the unit. Roundels and reflectors shall be clean and in good condition. (c) All light units shall flash alternately. The number of flashes per minute for each light unit shall be 35 minimum and 65 maximum. Each gate arm light shall be maintained in such condition to be properly visible to approaching highway users. Lights and light wire shall be secured to the gate arm. The voltage at each lamp shall be maintained at not less than 85 percent of the prescribed rating for the lamp. Each gate arm, when in the downward position, shall extend across each lane of approaching highway traffic and shall be maintained in a condition sufficient to be clearly viewed by approaching highway users. Each gate arm shall start its downward motion not less than three seconds after flashing lights begin to operate and shall assume the horizontal position at least five seconds before the arrival of any normal train movement through the crossing. At those crossings equipped with four quadrant gates, the timing requirements of this section apply to entrance gates only. A highway-rail grade crossing warning system shall be maintained to activate in accordance with the design of the warning system, but in no event shall it provide less than 20 seconds warning time for the normal operation of through trains before the grade crossing is occupied by rail traffic. (a) Train detection apparatus shall be maintained to detect a train or railcar in any part of a train detection circuit, in accordance with the design of the warning system. (b) If the presence of sand, rust, dirt, grease, or other foreign matter is known to prevent effective shunting, a railroad shall take appropriate action under §234.105, “Activation failure,” to safeguard highway users. Each highway-rail grade crossing train detection circuit shall detect the application of a shunt of 0.06 ohm resistance when the shunt is connected across the track rails of any part of the circuit. Each set of fouling wires in a highway-rail grade crossing train detection circuit shall consist of at least two discrete conductors. Each conductor shall be of sufficient conductivity and shall be maintained in such condition to ensure proper operation of the train detection apparatus when the train detection circuit is shunted. Installation of a single duplex wire with single plug acting as fouling wires is prohibited. Existing installations having single duplex wires with a single plug for fouling wires may be continued in use until they require repair or replacement. Each non-insulated rail joint located within the limits of a highway-rail grade crossing train detection circuit shall be bonded by means other than joint bars and the bonds shall be maintained in such condition to ensure electrical conductivity. Each insulated rail joint used to separate train detection circuits of a highway-rail grade crossing shall be maintained to prevent current from flowing between rails separated by the insulation in an amount sufficient to cause a failure of the train detection circuit. A switch, when equipped with a switch circuit controller connected to the point and interconnected with warning system circuitry, shall be maintained so that the warning system can only be cut out when the switch point is within one-half inch of full reverse position. Each wire shall be tagged or otherwise so marked that it can be identified at each terminal. Tags and other marks of identification shall be made of insulating material and so arranged that tags and wires do not interfere with moving parts of the apparatus. This requirement applies to each wire at each terminal in all housings including switch circuit controllers and terminal or junction boxes. This requirement does not apply to flashing light units, gate arm light units and other auxiliary light units. The local wiring on a solid state crossing controller rack does not require tags if the wiring is an integral part of the solid state equipment. Insulated wire shall be protected from mechanical injury. The insulation shall not be punctured for test purposes. A splice in underground wire shall have insulation resistance at least equal to that of the wire spliced. Wire on a pole line shall be securely attached to an insulator that is properly fastened to a cross arm or bracket supported by a pole or other support. Wire shall not interfere with, or be interfered with by, other wires on the pole line. Aerial cable shall be supported by messenger wire. An open-wire transmission line operating at voltage of 750 volts or more shall be placed not less than 4 feet above the nearest cross arm carrying active warning system circuits. Each sign mounted on a highway-rail grade crossing signal post shall be maintained in good condition and be visible to the highway user.
Title 49: Transportation
PART 234—GRADE CROSSING SIGNAL SYSTEM SAFETY
Subpart D—Maintenance, Inspection, and Testing
Maintenance Standards
§ 234.201 Location of plans.
§ 234.203 Control circuits.
§ 234.205 Operating characteristics of warning system apparatus.
§ 234.207 Adjustment, repair, or replacement of component.
§ 234.209 Interference with normal functioning of system.
§ 234.211 Security of warning system apparatus.
§ 234.213 Grounds.
§ 234.215 Standby power system.
§ 234.217 Flashing light units.
§ 234.219 Gate arm lights and light cable.
§ 234.221 Lamp voltage.
§ 234.223 Gate arm.
§ 234.225 Activation of warning system.
§ 234.227 Train detection apparatus.
§ 234.229 Shunting sensitivity.
§ 234.231 Fouling wires.
§ 234.233 Rail joints.
§ 234.235 Insulated rail joints.
§ 234.237 Reverse switch cut-out circuit.
§ 234.239 Tagging of wires and interference of wires or tags with signal apparatus.
§ 234.241 Protection of insulated wire; splice in underground wire.
§ 234.243 Wire on pole line and aerial cable.
§ 234.245 Signs.
Inspections and Tests
§ 234.247 Purpose of inspections and tests; removal from service of relay or device failing to meet test requirements.
(a) The inspections and tests set forth in §§234.249 through 234.271 are required at highway-rail grade crossings located on in service railroad tracks and shall be made to determine if the warning system and its component parts are maintained in a condition to perform their intended function.
(b) If a railroad elects not to comply with the requirements of §§234.249 through 234.271 because all tracks over the grade crossing are out of service or the railroad suspends operations during a portion of the year, and the grade crossing warning system is also temporarily taken out of service, a full inspection and all required tests must be successfully completed before railroad operations over the grade crossing resume.
(c) Any electronic device, relay, or other electromagnetic device that fails to meet the requirements of tests required by this part shall be removed from service and shall not be restored to service until its operating characteristics are in accordance with the limits within which such device or relay is designed to operate.
[61 FR 31806, June 20, 1996, as amended at 66 FR 49560, Sept. 28, 2001]
§ 234.249 Ground tests.
A test for grounds on each energy bus furnishing power to circuits that affect the safety of warning system operation shall be made when such energy bus is placed in service and at least once each month thereafter.
§ 234.251 Standby power.
Standby power shall be tested at least once each month.
§ 234.253 Flashing light units and lamp voltage.
(a) Each flashing light unit shall be inspected when installed and at least once every twelve months for proper alignment and frequency of flashes in accordance with installation specifications.
(b) Lamp voltage shall be tested when installed and at least once every 12 months thereafter.
(c) Each flashing light unit shall be inspected for proper visibility, dirt and damage to roundels and reflectors at least once each month.
§ 234.255 Gate arm and gate mechanism.
(a) Each gate arm and gate mechanism shall be inspected at least once each month.
(b) Gate arm movement shall be observed for proper operation at least once each month.
(c) Hold-clear devices shall be tested for proper operation at least once every 12 months.
§ 234.257 Warning system operation.
(a) Each highway-rail crossing warning system shall be tested to determine that it functions as intended when it is placed in service. Thereafter, it shall be tested at least once each month and whenever modified or disarranged.
(b) Warning bells or other stationary audible warning devices shall be tested when installed to determine that they function as intended. Thereafter, they shall be tested at least once each month and whenever modified or disarranged.
§ 234.259 Warning time.
Each crossing warning system shall be tested for the prescribed warning time at least once every 12 months and when the warning system is modified because of a change in train speeds. Electronic devices that accurately determine actual warning time may be used in performing such tests.
§ 234.261 Highway traffic signal pre-emption.
Highway traffic signal pre-emption interconnections, for which a railroad has maintenance responsibility, shall be tested at least once each month.
§ 234.263 Relays.
(a) Except as stated in paragraph (b) of this section, each relay that affects the proper functioning of a crossing warning system shall be tested at least once every four years.
(b)(1) Alternating current vane type relays, direct current polar type relays, and relays with soft iron magnetic structure shall be tested at least once every two years.
(2) Alternating current centrifugal type relays shall be tested at least once every 12 months.
(c) Testing of relays requiring testing on four year intervals shall be completed in accordance with the following schedule:
(1) Not less than 50% by the end of calendar year 1996;
(2) Not less than a total of 75% by the end of calendar year 1997; and
(3) One hundred percent by the end of calendar year 1998.
(d) Testing of relays requiring testing on two year intervals shall be completed by the end of calendar year 1996.
§ 234.265 Timing relays and timing devices.
Each timing relay and timing device shall be tested at least once every twelve months. The timing shall be maintained at not less than 90 percent nor more than 110 percent of the 41 predetermined time interval. The predetermined time interval shall be shown on the plans or marked on the timing relay or timing device. Timing devices which perform internal functions associated with motion detectors, motion sensors, and grade crossing predictors are not subject to the requirements of this section.
§ 234.267 Insulation resistance tests, wires in trunking and cables.
(a) Insulation resistance tests shall be made when wires or cables are installed and at least once every ten years thereafter.
(b) Insulation resistance tests shall be made between all conductors and ground, between conductors in each multiple conductor cable, and between conductors in trunking. Insulation resistance tests shall be performed when wires, cables, and insulation are dry.
(c) Subject to paragraph (d) of this section, when insulation resistance of wire or cable is found to be less than 500,000 ohms, prompt action shall be taken to repair or replace the defective wire or cable. Until such defective wire or cable is replaced, insulation resistance tests shall be made annually.
(d) A circuit with a conductor having an insulation resistance of less than 200,000 ohms shall not be used.
(e) Required insulation resistance testing that does not conform to the required testing schedule of this section shall be completed in accordance with the following schedule:
(1) Not less than 50% by the end of calendar year 1996;
(2) Not less than a total of 75% by the end of calendar year 1997; and
(3) One hundred percent by the end of calendar year 1998.
§ 234.269 Cut-out circuits.
Each cut-out circuit shall be tested at least once every three months to determine that the circuit functions as intended. For purposes of this section, a cut-out circuit is any circuit which overrides the operation of automatic warning systems. This includes both switch cut-out circuits and devices which enable personnel to manually override the operation of automatic warning systems.
§ 234.271 Insulated rail joints, bond wires, and track connections.
Insulated rail joints, bond wires, and track connections shall be inspected at least once every three months.
§ 234.273 Results of inspections and tests.
(a) Results of inspections and tests made in compliance with this part shall be recorded on forms provided by the railroad, or by electronic means, subject to approval by the Associate Administrator for Safety. Each record shall show the name of the railroad, AAR/DOT inventory number, place and date, equipment tested, results of tests, repairs, replacements, adjustments made, and condition in which the apparatus was left.
(b) Each record shall be signed or electronically coded by the employee making the test and shall be filed in the office of a supervisory official having jurisdiction. Records required to be kept shall be made available to FRA as provided by 49 U.S.C. 20107 (formerly §208 of the Federal Railroad Safety Act of 1970 (45 U.S.C. 437)).
(c) Each record shall be retained until the next record for that test is filed but in no case for less than one year from the date of the test.
Requirements for Processor-Based Systems
§ 234.275 Processor-based systems.
(a) Applicable definitions. The definitions in §236.903 of this chapter shall apply to this section, where applicable.
(b) Use of performance standard authorized or required.
(1) In lieu of compliance with the requirements of this subpart, a railroad may elect to qualify an existing processor-based product under part 236, subpart H of this chapter.
(2) Highway-rail grade crossing warning systems, subsystems, or components that are processor-based and that are first placed in service after June 6, 2005, which contain new or novel technology, or which provide safety-critical data to a railroad signal or train control system that is governed by part 236, subpart H of this chapter, shall also comply with those requirements. New or novel technology refers to a technology not previously recognized for use as of March 7, 2005.
(3) Products designed in accordance with subparts A through D of this part, which are not in service but are in the developmental stage prior to December 5, 2005 (or for which a request for exclusion was submitted prior to June 6, 2005 pursuant to §236.911 of this chapter), may be excluded from the requirements of part 236, subpart H of this chapter upon notification to FRA by March 6, 2006, if placed in service by December 5, 2008 (or March 7, 2008 for those products for which a request for exclusion was submitted to FRA prior to June 6, 2005). Railroads may continue to implement and use these products and components from these existing products. A railroad may at any time elect to have products that are excluded made subject to 49 CFR part 236, subpart H, by submitting a Product Safety Plan as prescribed in §236.913 of this chapter and otherwise complying with part 236, subpart H of this chapter.
(c) Product safety plan justifications. The Product Safety Plan (see §236.903 of this chapter) must explain how the performance objective sought to be addressed by each of the particular requirements of this subpart is met by the product, why the objective is not relevant to the product's design, or how safety requirements are satisfied using alternative means. Deviation from those particular requirements is authorized if an adequate explanation is provided, making reference to relevant elements of the Product Safety Plan, and if the product satisfies the performance standard set forth in §236.909 of this chapter. (See §236.907(a)(14) of this chapter.)
(d) Specific requirements. The following exclusions from the latitude provided by this section apply:
(1) Nothing in this section authorizes deviation from applicable design requirements for automated warning devices at highway-rail grade crossings in the Manual on Uniform Traffic Control Devices (MUTCD), 2000 Millennium Edition, Federal Highway Administration (FHWA), dated December 18, 2000, including Errata #1 to MUTCD 2000 Millennium Edition dated June 14, 2001 (http://mutcd.fhwa.dot.gov/).
(2) Nothing in this section authorizes deviation from the following requirements of this subpart:
(i) §234.207(b) (Adjustment, repair, or replacement of a component);
(ii) §234.209(b) (Interference with normal functioning of system);
(iii) §234.211 (Security of warning system apparatus);
(iv) §234.217 (Flashing light units);
(v) §234.219 (Gate arm lights and light cable);
(vi) §234.221 (Lamp voltage);
(vii) §234.223 (Gate arm);
(viii) §234.225 (Activation of warning system);
(ix) §234.227 (Train detection apparatus)—if a train detection circuit is employed to determine the train's presence;
(x) §234.229 (Shunting sensitivity)—if a conventional track circuit is employed;
(xi) §234.231 (Fouling wires)—if a conventional train detection circuit is employed;
(xii) §234.233 (Rail joints)—if a track circuit is employed;
(xiii) §234.235 (Insulated rail joints)—if a track circuit is employed;
(xiv) §234.237 (Reverse switch cut-out circuit); or
(xv) §234.245 (Signs).
(e) Separate justification for other than fail-safe design. Deviation from the requirement of §234.203 (Control circuits) that circuits be designed on a fail-safe principle must be separately justified at the component, subsystem, and system level using the criteria of §236.909 of this chapter.
(f) Software management control for certain systems not subject to a performance standard. Any processor-based system, subsystem, or component subject to this part, which is not subject to the requirements of part 236, subpart H of this chapter but which provides safety-critical data to a signal or train control system shall be included in the software management control plan requirements as specified in §236.18 of this chapter.
§ 234.275 Processor-based systems.
(a) Applicable definitions. The definitions in §236.903 of this chapter shall apply to this section, where applicable.
(b) Use of performance standard authorized or required.
(1) In lieu of compliance with the requirements of this subpart, a railroad may elect to qualify an existing processor-based product under part 236, subpart H of this chapter.
(2) Highway-rail grade crossing warning systems, subsystems, or components that are processor-based and that are first placed in service after June 6, 2005, which contain new or novel technology, or which provide safety-critical data to a railroad signal or train control system that is governed by part 236, subpart H of this chapter, shall also comply with those requirements. New or novel technology refers to a technology not previously recognized for use as of March 7, 2005.
(3) Products designed in accordance with subparts A through D of this part, which are not in service but are in the developmental stage prior to December 5, 2005 (or for which a request for exclusion was submitted prior to June 6, 2005 pursuant to §236.911 of this chapter), may be excluded from the requirements of part 236, subpart H of this chapter upon notification to FRA by March 6, 2006, if placed in service by December 5, 2008 (or March 7, 2008 for those products for which a request for exclusion was submitted to FRA prior to June 6, 2005). Railroads may continue to implement and use these products and components from these existing products. A railroad may at any time elect to have products that are excluded made subject to 49 CFR part 236, subpart H, by submitting a Product Safety Plan as prescribed in §236.913 of this chapter and otherwise complying with part 236, subpart H of this chapter.
(c) Product safety plan justifications. The Product Safety Plan (see §236.903 of this chapter) must explain how the performance objective sought to be addressed by each of the particular requirements of this subpart is met by the product, why the objective is not relevant to the product's design, or how safety requirements are satisfied using alternative means. Deviation from those particular requirements is authorized if an adequate explanation is provided, making reference to relevant elements of the Product Safety Plan, and if the product satisfies the performance standard set forth in §236.909 of this chapter. (See §236.907(a)(14) of this chapter.)
(d) Specific requirements. The following exclusions from the latitude provided by this section apply:
(1) Nothing in this section authorizes deviation from applicable design requirements for automated warning devices at highway-rail grade crossings in the Manual on Uniform Traffic Control Devices (MUTCD), 2000 Millennium Edition, Federal Highway Administration (FHWA), dated December 18, 2000, including Errata #1 to MUTCD 2000 Millennium Edition dated June 14, 2001 (http://mutcd.fhwa.dot.gov/).
(2) Nothing in this section authorizes deviation from the following requirements of this subpart:
(i) §234.207(b) (Adjustment, repair, or replacement of a component);
(ii) §234.209(b) (Interference with normal functioning of system);
(iii) §234.211 (Security of warning system apparatus);
(iv) §234.217 (Flashing light units);
(v) §234.219 (Gate arm lights and light cable);
(vi) §234.221 (Lamp voltage);
(vii) §234.223 (Gate arm);
(viii) §234.225 (Activation of warning system);
(ix) §234.227 (Train detection apparatus)—if a train detection circuit is employed to determine the train's presence;
(x) §234.229 (Shunting sensitivity)—if a conventional track circuit is employed;
(xi) §234.231 (Fouling wires)—if a conventional train detection circuit is employed;
(xii) §234.233 (Rail joints)—if a track circuit is employed;
(xiii) §234.235 (Insulated rail joints)—if a track circuit is employed;
(xiv) §234.237 (Reverse switch cut-out circuit); or
(xv) §234.245 (Signs).
(e) Separate justification for other than fail-safe design. Deviation from the requirement of §234.203 (Control circuits) that circuits be designed on a fail-safe principle must be separately justified at the component, subsystem, and system level using the criteria of §236.909 of this chapter.
(f) Software management control for certain systems not subject to a performance standard. Any processor-based system, subsystem, or component subject to this part, which is not subject to the requirements of part 236, subpart H of this chapter but which provides safety-critical data to a signal or train control system shall be included in the software management control plan requirements as specified in §236.18 of this chapter.
[70 FR 72384, Dec. 5, 2005]
Appendix A to Part 234—Schedule of Civil Penalties1
------------------------------------------------------------------------ Willful Section Violation violation------------------------------------------------------------------------ Subpart B_Reports234.7 Accidents involving grade crossing $5,000 $7,500 signal failure...............................234.9 Grade crossing signal system failure 2,500 5,000 reports...................................... Subpart C_Response to Reports of Warning System MalfunctionSec.234.101 Employee notification rules........... 2,500 5,000234.103 Timely response to report of 2,500 5,000 malfunction.................................. 234.105 Activation failure (a) Failure to notify_train crews..... 5,000 7,500 Other railroads................... 5,000 7,500 (b) Failure to notify law enforcement 2,500 5,000 agency............................... (c) Failure to comply with_flagging 5,000 5,000 requirements......................... Speed restrictions................ 5,000 7,500 (d) Failure to activate horn or 5,000 7,500 whistle.............................. 234.106 Partial activation (a) Failure to notify_train crews..... 5,000 7,500 Other railroads................... 5,000 7,500 (b) Failure to notify law enforcement 2,500 5,000 agency............................... (c) Failure to comply with_flagging 5,000 7,500 requirements speed restrictions...... (d) Failure to activate horn or 5,000 7,500 whistle.............................. 234.107 False activation (a) Failure to notify_train crews..... 5,000 7,500 Other railroads................... 5,000 7,500 (b) Failure to notify law enforcement 2,500 5,000 agency............................... (c) Failure to comply with_flagging 5,000 7,500 requirements......................... Speed restrictions................ 5,000 7,500 (d) Failure to activate horn or 5,000 7,500 whistle.............................. 234.109 Recordkeeping..................... 1,000 2,000Subpart D_Maintenance, Inspection, and TestingMaintenance Standards: 234.201 Location of plans................. 1,000 2,000 234.203 Control circuits.................. 1,000 2,000 234.205 Operating characteristics of 2,500 5,000 warning system apparatus................. 234.207 Adjustment, repair, or replacement 2,500 5,000 of component............................. 234.209 Interference with normal 5,000 7,500 functioning of system.................... 234.211 Locking of warning system 1,000 2,000 apparatus................................ 234.213 Grounds........................... 1,000 2,000 234.215 Standby power system.............. 5,000 7,500 234.217 Flashing light units.............. 1,000 2,000 234.219 Gate arm lights and light cable... 1,000 2,000 234.221 Lamp voltage...................... 1,000 2,000 234.223 Gate arm.......................... 1,000 2,000 234.225 Activation of warning system...... 5,000 7,500 234.227 Train detection apparatus......... 2,500 5,000 234.229 Shunting sensitivity.............. 2,500 5,000 234.231 Fouling wires..................... 1,000 2,000 234.233 Rail joints....................... 1,000 2,000 234.235 Insulated rail joints............. 1,000 2,000 234.237 Switch equipped with circuit 1,000 2,000 controller............................... 234.239 Tagging of wires and interference 1,000 2,000 of wires or tags with signal apparatus... 234.241 Protection of insulated wire; 1,000 2,000 splice in underground wire............... 234.243 Wire on pole line and aerial cable 1,000 2,000 234.245 Signs............................. 1,000 2,000Inspections and Tests: 234.247 Purpose of inspections and tests; 2,500 5,000 removal from service of relay or device failing to meet test requirements........ 234.249 Ground tests...................... 2,500 5,000 234.251 Standby power..................... 5,000 7,500 234.253 Flashing light units and lamp 1,000 2,000 voltage.................................. 234.255 Gate arm and gate mechanism....... 1,000 2,000 234.257 Warning system operation.......... 2,500 5,000 234.259 Warning time...................... 1,000 2,000 234.261 Highway traffic signal pre-emption 1,000 2,000 234.263 Relays............................ 1,000 2,000 234.265 Timing relays and timing devices.. 1,000 2,000 234.267 Insulation resistance tests, wires 2,500 5,000 in trunking and cables................... 234.269 Cut-out circuits.................. 1,000 2,000 234.271 Insulated rail joints, bond wires, 2,500 5,000 and track connections.................... 234.273 Results of tests.................. 1,000 2,000 234.275 Processor-Based Systems........... $5,000 $7,500------------------------------------------------------------------------\1\ A penalty may be assessed against an individual only for a willful violation. The Administrator reserves the right to assess a penalty of up to $27,000 for any violation where circumstances warrant. See 49 CFR Part 209, Appendix A.
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[61 FR 31806, June 20, 1996, as amended at 63 FR 11623, Mar. 10, 1998; 69 FR 30595, May 28, 2004; 70 FR 11094, Mar. 7, 2005] Appendix B to Part 234—Alternate Methods of Protection Under 49 CFR 234.105(c), 234.106, and 234.107(c) |
[This is a summary_see body of text for complete requirements]---------------------------------------------------------------------------------------------------------------- Flagger present, Flagger for each Police officer but not one for No flagger/no direction of present each direction of police traffic traffic----------------------------------------------------------------------------------------------------------------False Activation................ Normal Speed...... Normal Speed...... Proceed with Proceed with caution_maximum caution_maximum speed of 15 mph. speed of 15 mph.Partial Activation*............. Normal Speed...... Normal Speed...... Proceed with Proceed with caution_maximum caution_maximum speed of 15 mph. speed of 15 mph.Activation Failure**............ Normal Speed...... Normal Speed...... Proceed with Stop: Crewmember caution_maximum flag traffic and speed of 15 mph. reboard.----------------------------------------------------------------------------------------------------------------*Partial activiation_full warning not given. Non-gated crossing with one pair of lights designed to flash alternatively, one light does not work (and back- lights from other side not visible). Gated crossing_gate arm not horizontal; or any portion of a gate arm is missing if that portion had held a gate arm flashing light.**Activitation failure includes_if more than 50% of the flashing lights on any approach lane not functioning; or if an approach lane has two or more pairs of flashing lights, there is not at least one pair operating as intended.
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