These vehicles MUST NOT be used on motorways (see Rule 253). They should not be used on unrestricted dual carriageways where the speed limit exceeds 50 mph (80 km/h) but if they are used on these dual carriageways, they MUST have a flashing amber beacon. A flashing amber beacon should be used on all other dual carriageways (see Rule 220).
Laws RTRA sect 17(2) & (3), & RVLR reg 17(1) & 26
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