| 摘要 |
An integral hinge is described which is adapted to be used in conjunction with a roadside post safety breakaway system for sign panels and the like. The integral hinge plate is generally rectangular in configuration and planar and is provided with a notch or groove extending thereacross which represents a weakened line portion about which the two halves of the hinge may bend or at which point the hinge may be severed in tension. The hinge plates are fixedly mounted on opposite sides of each of the posts supporting the sign panel or the like. The material and configuration of the hinge plates and the notches or weakened line portions are selected to cause the hinge plates mounted on the impact side of the posts to rupture at the notches or weakened line portions while causing the hinge plates mounted on the side of the post opposite to the impact side to bend. In this manner, impact by a moving vehicle with a post and severance of the breakaway means severs the hinge plates on the impact side and permits the vehicle to deflect the impacted post about the hinge plates on the opposite side while the post remains attached to the sign panel or the like to prevent secondary collisions with the advancing vehicle or other objects or persons in the immediate collision area.
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