Road Safety Guide : Rule 46 Vehicle Restrictions
PROHIBITED ROADS
DUAL CARRIAGEWAY REGULATIONS
LEGAL CITATIONS
Road Traffic Regulation Act ( RTRA )
Governed by RTRA sections 17 ( 2 ) and 17 ( 3 ) .
Road Vehicles Lighting Regulations ( RVLR )
Safety lighting requirements are mandated under RVLR regulations 17 ( 1 ) and 26 .
Motorways ( Rule 253 ): Under Rule 46 , these specific vehicles MUST NOT be used on any motorway at any time .
Unrestricted Dual Carriageways ( > 50 mph )
Use is discouraged on roads where the limit exceeds 50 mph ( 80 km / h ) ; if used , the vehicle MUST be equipped with a flashing amber beacon .
Beacon Requirement ( Rule 220 )
Flashing amber beacons serve as the primary warning signal to other motorists of the vehicle's presence on high- speed roads .
Standard Dual Carriageways
For all other dual carriageways not exceeding 50 mph , a flashing amber beacon should be used for safety and visibility .