| 摘要 |
An improved tractor trailer having a tractor unit and a trailer unit and wherein the tractor unit includes an internal combustion engine, the improvement comprising an electrical drive arranged to drive at least some of the wheels on at least one of the axles of the trailer, in a control system associated therewith. The arrangement provides extra power for situations where it is required and can, in the case of electric drive motors mounted directly on the wheel, provide for better braking.
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