A pedestrian vs a modern car would suffer fewer injuries at 20mph than at 30mph due to all the safety features in car design these days. But against a HGV truck at the same speeds? Or even white-van-delivery-man rushing to get his drops done?
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					Originally Posted by joglynne  Not 30mph down to 20mph but I assume these finding are still relevant. | 
	
 I trust that involves a vehicle staying in the same gear.
My ULEZ-compliant car does 30mph in 4th at 1000rpm, but 20mph in 3rd at 1500rpm. It will stall in 4th before getting as low as 20mph.