On the European route E18 through Danderyd just north of Stockholm, variable speed limitsigns have been implemented on a stretch of road of approximately 2 km. Particular matter(PM10) and nitric oxide (NOx) concentration in the air have been measured. The collecteddata will periodically be analyzed.The purpose is to gain greater knowledge about the connection between vehicle speed and theconcentration of pollution in the air. Hopefully, by means of dynamic speed limit signs it willbe possible to lower the concentration of air pollution caused by traffic.Previous research at the Swedish National Road and Transport Research Institute (VTI) andthe Department of Applied Environmental Science, Stockholm University (ITM) clearlyindicate that emissions decrease as vehicle speed is lowered. Measurements of PM10 andNOx will continue until May 2010. A final report on the project is due by October 2010. If astatistically significant correlation is evident an inception to model dynamic speed limitsconsidering hour, day and season will be carried out and dynamic speed limit signs will beimplemented permanently. This can be of great help in setting standards for future societyplanning.
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