Abstract
On expressways in Japan, from 1997 to 2000,there were 164 traffic accidents related with maintenance vehicles working at fairly low speed. This kind of maintenance works includes snow removing and spraying of unit-freezing materials, which are sometimes dangerous and stressful for operators. Although there are some distance-warning systems for vehicles in the market, few trucks utilize such the advanced system. Therefore, all maintenance vehicles owned by JH have on board VMS for calling attentions and huge Bumper to protect themselves. Also, another important thing is make the maintenance vehicles colorful and easy to recognize ; however, it has not worked very well so far, and collisions against maintenance vehicles still remain. Therefore, it is quite necessary to develop a new collision avoidance system for maintenance vehicles by utilizing ITS Technology
