Abstract
Various factors which have played a role in the development of an obstacle barrier designed specifically to meet the requirements of the road system in the Netherlands are examined. The purpose of the RIMOB is to guard fixed obstacles against collisions. The basic concept is a configuration of tubes which are crumbled on impact. It is very easy to replace damaged parts, which makes maintenance cheap p. The RIMOB is meant for the protection of e.g. gantry posts at motorway exists and piers of viaducts.