Research was carried out by the SWOV into the most suitable crash barriers for soft soil and for bridges. The research was based on the following requirements: (1) sufficient strength and height; (2) the ability to deflect sufficiently without discontinuities; (3) very gradual deflection and sufficient space between carriageway and barrier; (4) continuation of operation after impact; (5) quickly to repair after a collision; (6) containing as many standardised parts as possible. The research resulted in a series of structures in soft soil and on bridges which provide optimum protection under various conditions. These barriers comprise in principle a horizontal beam consisting of two W-shaped rails and spacers every 1.33 metres, provided if necessary with diagonal bars, and of posts with various structural characteristics.
Samenvatting