| 词条 | Silent cop |
| 释义 |
| align = right | direction = vertical | width = 250 | image1 = Silent cop - Shortland 02.jpg | alt1 = | caption1 = | image2 = Silent cop - Shortland 01.jpg | alt2 = | caption2 = A silent cop in use at Hunter Valley Private Hospital in Shortland New South Wales, in December 2012.
A silent cop, also referred to as a "sleeping policeman"[1] or a "traffic dome", is a traffic management device formerly widely used in Australia. It consisted of a metal or concrete dome, about {{convert|400|mm|in|0|abbr=on}} wide and about {{convert|125|mm|in|0|abbr=on}} tall, embedded in the road surface. They were usually painted yellow and often decorated with retro-reflective glass beads or "cats eyes". The name has its origins from the Northern Beaches area of Sydney and was derived from the early days of motoring when policemen would be deployed at busy street corners to direct traffic, before traffic signals became widespread. Silent cops were placed in the middle of street intersections at cross roads, and turning drivers were expected to drive around them when turning right.[2] They were also placed in the centre of the terminating street at T-intersections to force drivers turning in or out of the street to be on the correct side of the road rather than cut the corner. The use of "silent cops" has been phased out in Australia, due to changes in the recommended method of performing turns (the introduction of the diamond turn at signalised intersections), and the hazard they posed to motorcyclists and pedestrians.[3] Notes1. ^In some languages, like Bulgarian, "sleeping policeman" refers to speed bump. 2. ^{{cite web|url=http://www.drivingnt.com/tips/dividedroads.html|title=Divided road turns|publisher=Zipper's Driving School|date=April 2010|accessdate=7 December 2012}} 3. ^{{cite web|url=http://www.drive.com.au/editorial/ArticleDetail.aspx?ArticleID=3409|title=Silent cops make a quiet exit|first=Tony|last=Davis|work=drive.com.au|date=17 June 2002|accessdate=7 December 2012}} ReferencesExternal links{{Commons category-inline|Silent cops}} 1 : Traffic calming |
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