British police are developing a new breed of roadside camera to
trap tailgating motorists.
They believe that, unlike existing speed cameras, the device will
be popular with drivers because it will combat one of the most
dangerous activities on Britain's crowded roads.
The laser camera will measure the gaps between vehicles and record
number plates so that offenders can be penalised.
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http://tvnz.co.nz/view/news_world_story_skin/427410?format=html
http://news.bbc.co.uk/2/hi/uk_news/3742765.stm