| 摘要 |
A courtesy light is provided for tractor-trailer to flash a THANK YOU after passing a motor who indicates it is safe to return to the right hand lane of the road. The courtesy light is mounted on the bumper of the truck between the vertical members of the bumper and above the horizontal member of the bumper where it is easily seen by automobile drivers. The courtesy light is operated by a switch in the cab of the tractor-trailer and may flash a single time of predetermined duration or flash intermittently with a single operation of the switch.
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