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Cameras & ISA

London Road Safety Unit

Intelligent speed adaptation (ISA)

LRSU continuously researches new and emerging technology to see how it could benefit the field of road safety. ISA is one such technology that has been researched and now developed for use in London.

What is ISA

Interior of a car showing ISA unit

Photograph of ISA

ISA is technology which helps drivers to keep to the speed limit. LRSU have created a digital speed limit map of London so that a vehicle fitted with an ISA unit knows the speed limit of every road in London.

Like Satellite Navigation Systems display directions to drivers via a small unit in the vehicle, an ISA unit can display the speed limit to drivers.

The ISA unit can work in two ways, Advisory ISA or Voluntary ISA:

Advisory ISA

A vehicle using Advisory ISA displays the speed limit to the driver via a small display unit on the dashboard. This ensures that the driver is always aware of the speed limit. The Advisory ISA can sound an alert to drivers who exceed the speed limit. The driver can then adjust their speed.

Voluntary ISA

A vehicle using Voluntary ISA also displays the speed limit to drivers via a small display unit. As well as sounding an alert to drivers who exceed the speed limit, this system can also physically prevent drivers from accelerating above the speed limit. Voluntary ISA does not apply any braking to a vehicle and the vehicle will only slow down due to friction.

ISA can reduce the likelihood that a driver will speed, it can also improve driver style and can lead to a reduction in CO2 and fuel costs.

How to use ISA

LRSU have created a pilot Advisory ISA. Work is ongoing to develop a pilot for the Voluntary ISA.

Trialling the Advisory ISA

If you are interested in trialling the ISA system please visit the ISA pagesThis is an external site. on the Transport for London website. These pages also offer information for developers who want to create applications for common satellite navigation systems, the digital speed limit map is also available.