| 摘要 |
A frangible boom assembly for vehicular tollway barriers is mounted to a boom actuating apparatus for pivotal movement between a barrier position transverse to a direction of traffic flow and a generally upright position to allow an authorised vehicle to pass. The frangible boom assembly is pivotally mounted to the actuation apparatus whereby in use, contact between a vehicle and the boom, when in a barrier position, causes said boom to swing away from the vehicle in the direction of traffic flow to reduce the possibility of damage to the boom member and/or the vehicle.
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