How intriguing. I have never stopped to look at those big machines - well normally we cant' stop and look because we see them working on contraflows in the middle of the country, so once you are going in the middle of a stream of traffic, you just keep going all the way to the end.
![B[lack] on B[lack]](https://media.365project.org/1/9514584_agklpqsy06_sq.jpg "B[lack] on B[lack]")
