Have you read the post "High Speeding Prevention" by Zoya? There are such words like: "It would be just great to install a special road post with a device to fix every passing car's speed". So I only wanted to prolong her idea and those devices could be modernized to such type of long iron line like mono-railway so cars could link with it in case of necessity as if the tyre would be pierced and the automobile wouldn't turn over. It would help us to avoid multitudinous number of accidents I think.