This type of brake tester is normally used in UK garages when used as part of an inspection lane for the MOT test.In order to minimize any inaccuracy and variation in the measurement, the roller diameter is sufficiently large to reduce the effects of the mechanical relaxation, or flexing, of the tire itself.A special coating on the rollers is designed to be very wear resistant and provide good friction values, both in wet and dry conditions.The extremely accurate plate brake method of measuring a vehicle's braking performance in countries such as Australia and New Zealand is increasingly becoming a far more popular alternative to basic decelerometers due to not only accuracy, measurement speed, and the ease of use, but predominately the greatly improved safety offered by removing the need for vehicle inspectors to brake test vehicles on public roads amongst other road users .A decelerometer is a hand held device for measuring dynamic braking forces during a vehicle road test.
