Räfflor: effekter och konsekvenser av olika räffeltyper vid mitträffling på 2-fältsvägar

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Milled rumble strips is one way to attract the drivers’ attention when they involuntarily are about to leave the lane. The rumble strips provide both internal and external noise but also vibrations in the vehicle. The overall aim of this work is to elucidate the effects and consequences of the use of intermittent milled rumble strips compared to sinus milled rumble strips in the center of the road. The comparison take into account; external noise, internal noise, vibrations, damage to the road surface and the price. However, due to lack of data, vibrations and price issues are excluded here. The results show that the intermittent rumble strips provide an increase of external noise on the 2–8 dB (A). The corresponding figure for the sinus rumble strip is 0.0 to 4 dB (A). Further, it is found that the sinus rumble strips provide more low frequency noise (30–40Hz) compare to the intermittent rumble strips (60–160 Hz). Maximum noise from intermittent rumble strips are obtained around 80–90 km/h, and at 90 km/h the threshold for noise for those living close to the road is 90–140 meters. It is not known at what speed the sinus rumble strip provide the maximum noise. Regarding the internal noise most studies have focused on passenger cars and an increase in internal noise when driving on intermittent rumble strips varies between 13–17 dB (A). Results from simulator studies show that even low levels of internal noise is helpful for drivers who are about to leave the lane due to sleepiness. The sinus rumble strips provide not only noise but also vibrations.

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