扩展阅读 http://en.wikipedia.org/wiki/Speedometer#Error 文摘1: Vehicle manufacturers usually calibrate speedometers to read high by an amount equal to the average error, to ensure that their speedometers never indicate a lower speed than the actual speed of the vehicle, to ensure they are not liable for drivers violating speed limits. 文摘2: United States: Federal standards in the United States allow a maximum 5 mph error at a speed of 50 mph on speedometer readings for commercial vehicles. [13] [13] § 393.82 Speedometer. Each bus, truck, and truck-tractor must be equipped with a speedometer indicating vehicle speed in miles per hour and/or kilometers per hour. The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph). [70 FR 48054, Aug. 15, 2005]
【在 f****u 的大作中提到】 : 扩展阅读 http://en.wikipedia.org/wiki/Speedometer#Error : 文摘1: : Vehicle manufacturers usually calibrate speedometers to read high by an : amount equal to the average error, to ensure that their speedometers never : indicate a lower speed than the actual speed of the vehicle, to ensure they : are not liable for drivers violating speed limits. : 文摘2: : United States: : Federal standards in the United States allow a maximum 5 mph error at a : speed of 50 mph on speedometer readings for commercial vehicles. [13]
【在 f****u 的大作中提到】 : 扩展阅读 http://en.wikipedia.org/wiki/Speedometer#Error : 文摘1: : Vehicle manufacturers usually calibrate speedometers to read high by an : amount equal to the average error, to ensure that their speedometers never : indicate a lower speed than the actual speed of the vehicle, to ensure they : are not liable for drivers violating speed limits. : 文摘2: : United States: : Federal standards in the United States allow a maximum 5 mph error at a : speed of 50 mph on speedometer readings for commercial vehicles. [13]