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Under standard dimension rules for an ordinary non-agricultural rigid truck, how far may the vehicle or its load extend forward from the front edge of the driver’s seat in its rearmost position?
按标准尺寸规则，对普通非农用刚性卡车，驾驶座调到最后位置时，车辆或货物最多可以超出驾驶座前缘多远？
With the driver's seat in its rearmost position, the maximum forward overhang from its front edge is 3 metres.
驾驶座调到最后位置时，从座位前缘到车辆或货物最前端的前悬，上限为3米。
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Do not measure an extra 3 metres from the front bumper. Overall length, forward distance and other applicable limits must also be met.
这是前悬的量法，不是从车头保险杠再额外增加3米；还要符合总长、前向距离等其他限制。