I'm a road safety consultant from London UK. I recently had an article published at roadsahead.co.uk regarding rumble strips. In contrast to speed bumps, which abruptly and frequently inconveniently slow traffic, rumble strips provide a softer but no less powerful warning. These seemingly insignificant ridges in the road surface really decrease accidents by a considerable amount, especially in regions where drivers tend to be careless or speed. Their capacity to pique a driver's interest via a combination of vibrations and loudness is second to none. However, they are underappreciated even though they are highly effective.