| 摘要 |
<p>An improved redirective end treatment (10) uses a braking system (62) providing a varied braking force to maintain the rate of deceleration of a vehicle impacting the end treatment (10) at or below a predetermined value. The end treatment (10) includes a guardrail structure (11) and an impact sled (16) positioned ahead of the guardrail structure (11). Pivotally attached to the front of the guardrail structure (11) is a smart braking unit (41) positioned within the impact sled (16). When a vehicle collides with the impact sled (16), the impact sled (16) is caused to translate backwards towards the braking unit (41) and guardrail structure (11). As the impact sled (16) collides with the braking unit (41), the guardrail structure (11) is caused to move vertically and fold in a scissors-like action. The amount of linear space finally occupied by the end treatment (10) is then reduced, but because the impact sled (16), braking unit (41) and guardrail structure (11) are not physically damaged they can be returned to their original positions for reuse.</p> |
