| 摘要 |
A spacer arm (12) for anchoring a road metal sheet strip or guardrail to support stakes is disclosed, which arm absorbs and dissipates the energy produced by the impact of a car against the guardrail due to its own structure, and keeps the guardrail generally in an operative position even in case of collision of heavy cars. To this purpose the arm is weakened by providing weaker zones (14,16) which are so designed as to be deformed in a differential way and cause their adjoining portions to rotate and/or to lengthwise slide after, the collision according to the stress to which the spacer is subjected. <IMAGE> |
