The effect of screening on road surface temperatures is analysed using datafrom the Swedish road weather information system (RWIS) together with datafrom thermal mapping. The study deals with the analysis of temperaturevariations caused by shading of the road surface during clear daytimeconditions and focuses on the relation between solar elevation and magnitudeof road surface temperature differences between screened and sun-exposedareas. Also included is an analysis of how the temperature differencesduring the day affect the establishment of temperature variations aftersunset and the time it takes after sunset for temperature differences causedby shading to decline. The results show that the magnitude of road surfacetemperature differences between sun exposed and screened sites(RSTdiff) that develop during clear day conditions canbe attributed to solar elevation (β) and can be expressed by theequation: RSTdiff=−2.7+0.46(β). Arelationship between the daily maximum temperature difference andthepreservation of the screening effect after sunset is observed. The effectafter sunset can be described by:RSTdiff=A−Bh+Ch2−Dh3−Eh4+Fh5,where h is the time in hours after sunset and A to Fare constants related to the time of the year at the actual site.