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Research Study Report: PHYSICS 1. Speed limit in Britain changed 100 years Ministers are planning to crack down on motorists who speed on motorways in an attempt to meet government targets aimed at reducing Britain's emissions of greenhouse gases. Officials acknowledge that any move to force the 15 million motorists who currently exceed the 70 mph speed limit to slow down would be "politically sensitive", but they say it would save significant amounts of carbon dioxide pollution. Engine efficiency falls quickly beyond 70 mph. From 1930 to 1965, most roads outside urban areas, including motorways, did not have a speed limit. However, in December 1965, after a series of multiple crashes on motorways, mainly in fog, an experimental speed limit of 70 mph (112 km/h) was introduced for motorways and all other unrestricted roads,[15] and made permanent in 1967 for motorways and dual carriageways with a central reservation (with the limit dropped to 60...

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