Keith Peat believes that speed limits should be set professionally (Letters LTT 12 Jun). As a qualified and experienced transport engineer, so do I.
The correct method has always been the 85th-percentile system. This says that the posted speed limit should be set as follows: The traffic is observed on-street. The vehicle speeds are ranked in order, and the 85th-percentile highest speed is chosen. The closest multiple of 10mph to the 85th percentile speed is posted, although in practice a...
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