Rumble strip
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Rumble strips alert drivers both by causing a tactile vibration and the namesake audible rumbling. Occasionally in the UK, they may be painted horizontally across the road in groups of 5 as a traffic calming method, to slow drivers down.
Rumble strips were 'officially' invented by the Pennsylvania Turnpike Commission in 1987 as a part of the Sonic Nap Alert Program (SNAP) after a survey from the 1980's revealed that the number one contributor to PA Turnpike accidents were DOR accidents, or Drift-Off-Road accidents. They had been used before this time, and were originally named 'Charlie Strips' after the inventor's son Charlie drifted off the road one night and was killed[[Citing sources citation needed]]. The first section of test roadway is located just east of Breezewood, PA on a repaved section of the Abandoned Pennsylvania Turnpike. After their installation, the first five SNAP project roadways showed a 70% reduction in DOR accidents.
See also
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