Externt buller från mitträfflor

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Mikael Ögren

Milled centerline rumble strips are used as a safety measure by alerting the driver via sound and vibration inside the vehicle. A secondary effect is that exterior noise is generated and that is a potential cause of annoyance and sleep disturbance for inhabitants living close to the road. This report describes a series of measurements and calculations with the aim of determining how many rumble strip hits that can be expected and what sound levels can be generated. The number of hits was determined using a total of ten days of measurements from four different locations and the results show that 0.2 to –1.0 per cent of all vehicle passages hit the rumble strip. The percentage of vehicles that hit the strip increases during night. The noise levels that are generated during a hit were determined by controlled pass-by measurements at different speeds with three different vehicles, a car with normal tires, a car with low profile tires and a truck (towing engine of semi-trailer). These measurements where then used to predict the outdoor and indoor noise levels. The calculations show that the Swedish guideline values may be exceeded at short distances, but it may be questioned if the road traffic noise guidelines are valid for rumble strip hits, since the noise is both impulsive and tonal in character.

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