49 C.F.R. § 236.21 Location of roadway signals.
Title 49 - Transportation
Each roadway signal shall be positioned and aligned so that its aspects can be clearly associated with the track it governs. [49 FR 3383, 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 A—Rules and Instructions: All Systems
Roadway Signals and Cab Signals
§ 236.21 Location of roadway signals.