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Are there special dispensations for older cars without speedometers when it comes to average speed cameras?

Cars made before 1932 do not have to have a speedometer. Are there any special dispensations for these cars when they pass through camera controlled average speed sections of road? GPS speedos have issues that could lead to an inaccurate reading.

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We asked the Federation of British Historic Vehicles. Bob Owen, director of legislation, said, 'In general, there are no dispensations from the requirement to observe speed limits, whether or not average limits, on account of the vehicle not having a speedometer. In my personal experience, and knowing the underlying methodology of GPS systems, use of a GPS system to measure speed should provide a high level of confidence in compliance with average speed zones.'
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