Effects of weather controlled speed limits on driver behaviour on a two-lane road

Effects of weather controlled speed limits on driver behaviour on a two-lane road

Pirkko Rämä

The development of Intelligent Transportation Systems (ITS) has caused road authorities to pay more attention to the provision of traffic information. New technology has produced smart sensors and automated data collection, modification and processing systems such as Road Weather Stations (RWSs). The Finnish Road Administration has adopted a policy to develop ITS applications gradually, using experimentation on a problem-driven as opposed to technology-driven bases. A significant problem in northern countries is the relatively high accident risk during slippery road conditions in winter. On the weather controlled E18 road in southeast Finland speed limits are controlled by data from unmanned RWSs. The speed limits are lowered automatically during adverse road conditions and in some cases signs for slippery road conditions are displayed as well. Six RWSs along this section collect standard meteorological data, which is fed automatically every 5 minutes to the central station for storage and analysis. This study of the two lane section of the roadway investigated the effects of dynamic speed limits and slippery warnings on driving speeds and headways. Driver acceptance of the weather-controlled road was also studied, and a reliability analysis was performed as well.



International Conference on Electric Road Systems starts today

Electric Road Systems (ERS) is a relatively new concept with many initiatives on the way. To learn from each other and stimulate new collaborations the Swedish Research and Innovation Platform for Electric Roads arranged the first international conference...


Same survey of road users’ attitudes in 50 countries

At the Road Safety on Five Continents Conference, RS5C, one entire session presented a large survey of road users' attitudes in 38 countries. Results show large differences between countries in many areas, both regarding behavior and attitudes. A new survey...


Good results with alcohol interlock program according to Swedish study

An alcohol interlock program makes it possible for drink driving offenders to continue their everyday lives. In a Swedish study most of the participants were satisfied with the program and experienced improved health. They also reported drinking alcohol more...


Traffic safety in the spotlight

Today the Conference Road Safety on Five Continents (RS5C) opened in Jeju Island, South Korea. More than 220 participators have come from all over the world to present findings and learn about traffic safety. Dr. Young Tae Kim, Secretary-General of the...


VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...