49 C.F.R. § 236.713 Bridge, movable.
Title 49 - Transportation
That section of a structure bridging a navigable waterway so designed that it may be displaced to permit passage of traffic on the waterway.
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 G—Definitions
§ 236.713 Bridge, movable.