49 C.F.R. § 236.407 Approach or time locking; where required.
Title 49 - Transportation
Approach or time locking shall be provided for all controlled signals where route or direction of traffic can be changed. [49 FR 3386, Jan. 26, 1984]
Title 49: Transportation
PART 236—RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES
Subpart D—Traffic Control Systems
Standards
§ 236.407 Approach or time locking; where required.
