速度照査が導入されたのはいつ
Traffic calming was built into the 1865 Locomotive Act in the UK, which set a speed limit of in towns and out of town, by requiring a man with a red flag to walk ahead of qualifying powered vehicles. The distance ahead of the pedestrian crew member was reduced to in 1878 and the vehicles were required to stop on the sight of a horse. The speed limit was effectively redundant as vehicle speeds could not exceed the speed at which a person could walk.
1865