Intelligent Speed Adaptation (ISA) is an on-board system that helps the driver comply with speed limits. It uses GPS to connect the vehicle to a digital road map and either advise the driver of the limit (advisory ISA) or intervene with the controls to ensure adherence to the limit (mandatory ISA). Use this page to access research on the benefits of ISA.
Reducing the risk of rear-end collisions with infrastructure-to-vehicle (I2V) integration of variable speed limit control and adaptive cruise control system
School of Transportation, Southeast University, Nanjing, China, 13/01/16
Integrating adaptive cruise control with roadside variable speed limit controls reduces rear-end collision risks on freeways.
Intelligent speed assistance for serious speeders
Delft University of Technology, 11/07/14
A trial of voluntary intelligent speed adaptation with Dutch speed offenders found it reduced speed during the trial but didn't improve long-term behaviour once the technology was removed.
Driver support systems: Estimating road safety effects at varying levels of implementation
Norwegian Institute for Transport Economics, 31/03/14
Full implementation of Intelligent Speed Adaptation (ISA) would save 41 lives per year in Norway.
Voluntary ISA would reduce fatal collisions involving trucks and buses by 25%
European Commission, 09/08/13
Fitting all trucks and buses with voluntary ISA that provides feedback on speed would reduce fatal collisions involving these vehicles by 25%.
Intelligent speed adaptation and alcohol interlocks can reduce commercial vehicle crashes
European Transport Safety Council, 17/04/13
European member states should prioritise intelligent speed adaptation and alcohol interlocks to reduce commercial vehicle crashes.
In-car speeding alert system more effective when combined with financial incentives
National Highway Traffic Safety Administration, 12/02/13
An in-car system to alert speeding drivers was more effective in a trial when combined with financial incentives for drivers who did not speed.
Cost benefit analysis of Intelligent Speed Adaptation
Centre for Automotive Safety Research, 10/06/11
Fitting mandatory Intelligent Speed Adaption to all vehicles in Australia would reduce injury crashes by 26% and save $3,725 million annually.
Potential for in-car speed assistance systems
Ghent University, 21/03/11
95% of Belgians and Dutch people are in favour of Intelligent Speed Adaptation.
Can enforced behaviour change attitudes?
The Institute for Transport Studies, 16/08/10
Trialling mandatory Intelligent Speed Adaptation for a limited period only subsequently improves drivers’ attitudes to speed but not speeding behaviour.
Smarter Moves report
The Sustainable Development Commission, UK, 27/01/10
The UK government should encourage the use of Intelligent Speed Adaptation (ISA)as well as time over distance cameras.
Low range speeding and the potential benefits of intelligent speed assistance
Vehicle Design & Research Pty Ltd, 11/11/09
ISA can be effective at reducing casualties including those many casualties caused by drivers breaking speed limits by only a little.
Action Plan for the Deployment of Intelligent Transport Systems in Europe
European Transport Safety Council, 13/02/09
Welcomes the proposals and provides recommendations.
Speed limit adherance and its effect on road safety and climate change
Commission for Integrated Transport and the Motorists’ Forum, 30/12/08
Recommends speed limiters should be fitted to vehicles to reduce carbon emissions and cut crashes.