Editing Speed bump (section)

===Dynamic speed bumps===
Dynamic speed bumps differ from conventional speed bumps in that they only activate if a vehicle is traveling above a certain speed. Vehicles traveling below this speed will not experience the discomfort of a conventional speed bump. Dynamic speed bumps may allow the passage of [[emergency vehicle]]s at higher speeds.

The [[Actibump]] system, successfully used in Sweden, is based on powered equipment integrated into the road surface, which operates a platform that is lowered a few centimeters when a speeding vehicle approaches. Any vehicle approaching at or under the speed limit will pass on a level road. The system measures the speed of an oncoming vehicle by using radar.<ref>{{cite web|title=Actibump|url=http://www.actibump.com|publisher=Edeva|access-date=2016-12-01}}</ref>

In another design, a rubber housing is fitted with a [[pressure relief valve]] that determines the speed of a vehicle. If the vehicle is traveling below the set speed, the valve opens allowing the bump to deflate as the vehicle drives over it, but it remains closed if the vehicle is traveling too fast. The valve can also be set to allow heavy vehicles, such as [[Fire apparatus|fire trucks]], [[ambulance]]s, and [[bus]]es to cross at higher speeds.<ref>{{cite journal|url=https://www.newscientist.com/article.ns?id=dn1178 |journal=New Scientist |title=Smart speed bumps reward safe drivers |url-status=dead |archive-url=https://web.archive.org/web/20070326103037/http://www.newscientist.com/article.ns?id=dn1178 |archive-date=March 26, 2007 }}</ref><ref>{{cite news|url=http://www.timesonline.co.uk/article/0,,2-1867157,00.html |work=The Times |title=Smart' road hump will smooth the way for safe drivers |location=London |first=Shirley |last=English |date=November 11, 2005 |access-date=May 23, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20060113164245/http://www.timesonline.co.uk/article/0%2C%2C2-1867157%2C00.html |archive-date=January 13, 2006 }}</ref>