Vehicles exempt from SRT requirements

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• Rigid vehicles fitted with a turntable coupling to tow a semi-trailer, provided they don't have a deck or a body for carrying a load (these are usually called 'tractor units')
• Vehicles (including their loads) that have dimensions greater than standard or have axle weights greater than a vehicle axle index of 1.1, provided such vehicles comply with the relevant legislation and the conditions of any permits they need to operate outside the standard dimensions and axle weights
• Construction vehicles being used on roads that are designated 'road construction zones' under the Heavy Motor Vehicle Regulations
• Construction vehicles being used on roads designated 'roadworks zones' by a road controlling authority
• Special vehicles that are not usually used on roads but that have been authorised to cross a particular road by a road controlling authority
• Motor scrapers and similar vehicles that are designed for transporting bulk materials and only move along roads without a load.
• Vehicles with tipping load bodies, but only when they are in the process of discharging their load by tipping up their body and moving at a speed of up to 10 km/h. When the load body isn't tipped, these vehicles need to comply with SRT requirements
• Vehicles engaged in a vehicle recovery service that are designed to tow or transport disabled heavy vehicles
• Vintage or veteran vehicles first registered before 1 January 1940.