Evaluation of Traffic Signals Results

Plenary on 2009-12-09
Session date: 
December 9, 2009
Question By: 
Murad Qureshi
Labour Group
Asked Of: 
Boris Johnson (Chair, TfL) and Sir Peter Hendy (Commissioner, TfL)


What weight is given to the needs of pedestrians, to road safety and to the impact of any change on London's air quality when TfL evaluates traffic signals?


Answer for Evaluation of Traffic Signals Results

Answer for Evaluation of Traffic Signals Results

Answered By: 
Boris Johnson (Chair, TfL) and Sir Peter Hendy (Commissioner, TfL)

All decisions are data-led. When TfL engineers conduct a routine review of the timings at a traffic signal site, there are clear operational performance guidelines to be followed. There are two main objectives. The first is to avoid overcrowding of pedestrians waiting on the pavement at signalised crossings, achieved by changing signal timings to reduce the amount of time pedestrians must wait for a green man. This improves safety by helping pedestrians to avoid having to spill into the carriageway, or crossing against a red man. The second objective is to reduce unnecessary queues, stops and delays for vehicles. In reducing these stops and delays there is a reduction in emissions and therefore it has a positive impact on air quality. TfL's London Road Safety Unit (LRSU) monitors collision rates at all junctions in London and increases in collisions will be raised with the relevant Highway Authority, who will work with TfL to identify the cause and remedy the problem.