A study by the Swedish Road and Transport Research Institute VTI shows that milled rumble strips at the centre of a two lane road are probably an excellent measure to reduce the number of head-on collisions which occur because tired and inattentive drivers inadvertently leave the lane they are driving in.
The study shows that one of the effects of milled rumble strips at the centre of the road is to make car drivers reduce their speed and keep further away from the centre of the road.
Milled rumble strips have been found to work well on Swedish roads which are not wide enough to have a central barrier such as a wire rope barrier. However, no effects have been found which cause changes in the behaviour of the drivers of heavy vehicles.
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