LED Technology

Plenary on 2006-12-06
Session date: 
December 6, 2006
Question By: 
Murad Qureshi
Labour Group
Asked Of: 
Peter Hendy (Commissioner, Transport for London)


What percentage of traffic lights in London owned by TfL use LED technology?


Answer for LED Technology

Answer for LED Technology

Answered By: 
Peter Hendy (Commissioner, Transport for London)

We are trialling this technology, and therefore the percentage of traffic signals that use LED is small at less than 2%.

We are taking a strong interest in LED signals with the first trial site installed in 1998. The power consumption of LEDs is significantly less than traditional tungsten halogen traffic signals. Changing London's traffic signals to LED could have a worthwhile impact on energy and maintenance efficiency.

TfL is examining ways of rolling out LED signals over a wide area. However a number of issues remain to be addressed before this is viable, including:

· Our ability to safely and effectively monitor performance of LED signals, and ensure that new products are compatible with existing controllers. · Build a robust business case: LED are about five times more expensive than traditional signals. · Understand the reliability of emerging products, some of which have shown a high failure rate and have had to be removed or modified.

Considerable progress continues to be made and products are now becoming more stable. Designs which can be monitored are being produced and TfL has a project trialling these with a view to wider deployment beginning late next year.