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Q #25 - What's the purpose of road humps, chicanes and narrowings?

Traffic-calming measures help to keep vehicle speeds low in congested areas where there are pedestrians and children. A pedestrian is much more likely to survive a collision with a vehicle travelling at 20 mph than they are with a vehicle travelling at 40 mph.

	To separate lanes of traffic
	To increase traffic speed
	To allow pedestrians to cross
	To reduce traffic speed