About: Slough experiment

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The Slough experiment was a two-year road safety trial carried out in Slough, Berkshire, England, from 2 April 1955 to 31 March 1957. Different road safety innovations were tested to determine if they would reduce the number of road accidents. Amongst other innovations the experiment trialled the first linked traffic signals in the country, single yellow no-waiting lines, a keep left system for pedestrians and yield signs at junctions (the latter developed into the modern give way sign). The experiment also saw the first use of 20 mph and 40 mph speed limits in the UK. The experiment cost at least £133,100 and resulted in a 10% reduction in serious injuries and fatalities.

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  • The Slough experiment was a two-year road safety trial carried out in Slough, Berkshire, England, from 2 April 1955 to 31 March 1957. Different road safety innovations were tested to determine if they would reduce the number of road accidents. Amongst other innovations the experiment trialled the first linked traffic signals in the country, single yellow no-waiting lines, a keep left system for pedestrians and yield signs at junctions (the latter developed into the modern give way sign). The experiment also saw the first use of 20 mph and 40 mph speed limits in the UK. The experiment cost at least £133,100 and resulted in a 10% reduction in serious injuries and fatalities. (en)
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  • The Slough experiment trialled the use of 20mph and 40mph speed limits, crossroad advanced warning signs and yield/give way signs . (en)
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  • UK traffic sign 501.svg (en)
  • UK traffic sign 504.1.svg (en)
  • UK traffic sign 670V20.svg (en)
  • UK traffic sign 670V40.svg (en)
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  • The Slough experiment was a two-year road safety trial carried out in Slough, Berkshire, England, from 2 April 1955 to 31 March 1957. Different road safety innovations were tested to determine if they would reduce the number of road accidents. Amongst other innovations the experiment trialled the first linked traffic signals in the country, single yellow no-waiting lines, a keep left system for pedestrians and yield signs at junctions (the latter developed into the modern give way sign). The experiment also saw the first use of 20 mph and 40 mph speed limits in the UK. The experiment cost at least £133,100 and resulted in a 10% reduction in serious injuries and fatalities. (en)
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  • Slough experiment (en)
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