Vehicle Speeds on Hammersmith Bridge

The following plots come from a DfT unpublished document

Report considering the benefits and feasibility of implementing a
20mph speed limit on London's Bridges (Thames Crossings)

Road Safety Engineering / London Road Safety Unit
Road Network Performance / TfL Street Management

December 2008

They show the average readings for values taken over 7 consecutive days.

!5% of the traffic is travelling faster than the 85 %ile speed. On the southbound lane 15% of the traffic is squeezing past cyclists at over 30mph for most of the day.