Räfflor i mitten av körfältet: ett försök i Skaulo

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The aim with the study was to evaluate the effects on road user behavior when using milled rumble strips in the centre of the lane on a road 6.5 meters wide. The evaluation included measurements of speed and lateral position. Measurements were done before and after milling, and focus group interviews were perfomed with motorcyclists and truck drivers after realisation. The results of the measurements of speed and lateral position showed that milled rumble strips in the middle of the lane do not affect car drivers. A slight increase in the standard deviation of the lateral position for passenger cars may be noted. Truck drivers were affected slightly more: significantly lower speed was detected as well as that trucks moved closer to the road centre, and the standard deviation of lateral position increased. This is not what the drivers themselves report to experience. They say that their choice of speed is unchanged. All in all truck drivers were negative to the rumble strips in the centre of the lane. One argument was that they disturbe the "line" during the drive and make it difficult to choose the placement they want to have. Truck drivers do not believe that they, in case of falling asleep, (in contrary to expectations) would have time enough to act in order to aviod a crash, since the roads are too narrow. Also the motorcyclists are negative to the centre lane location of rumble strips. They agree, however, that rumble strips in the centre of the road and in the roadside are postitive in terms of traffic safety.

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