Adaptive speed limit system on Tallinn-Pärnu highway


At the request of the Estonian Road Administration, Traffest installed an adaptive speed limit system at the so-called Kasti intersection on the 67th kilometer of the Tallinn-Pärnu-Ikla highway in Estonia. The aim of this project was to create a smooth and safe traffic flow by changing the speed limit according to need.

Traffest installed variable message signs and sensors at Kasti intersection where the regular speed limit is 90 km/h. When there are vehicles approaching the intersection from side roads or the opposite side’s left turn lane, the sensors send information to the variable message signs which then change the speed limit from 90 km/h to 70 km/h. After the left turn lane and side roads are empty, the warning signs go out and the usual speed limit is restored.

Similar solutions are already in use in Denmark and Sweden. With this project the Road Administration aims to find out how this kind of solution influences road safety and driver’s behaviour on the road and whether we should implement this kind of solution elsewhere in Estonia or not.

Video: Estonian Road Administration