Warnings Slow Down Drivers, Temporarily

A new study from Uppsala University indicates that systems in cars that warn drivers when they are speeding do get them to slow down, but only temporarily.

The newspaper “Svenska Dagbladet” reports that the doctoral dissertation concludes that after three years, motorists are ignoring the warning systems. The study followed 250 motorists in Borlänge in the province of Dalarna who had their cars fitted with the ISA speeding warning system.

Before the test period the motorists drove too fast 25 percent of the time. After the ISA system was installed, that dropped to just 8.5 percent. However, after three years the motorists were back to exceeding the speed limit 19 percent of the time.