S. Thordarson Vegsyn Consult, Hafnarfjordur, Iceland skuli@vegsyn.is N. Jonasson Icelandic Road Administration, Reykjavik, Iceland nicolai.jonasson@vegagerdin.is E. Sveinbjornsson Vedurvaktin Meteorological Services, Gardabaer, Iceland vedurvitinn@gmail.com A. H. Thorolfsson University of Iceland, Reykjavik, Iceland ath68@hi.is G. O. Bjornsson Almenna Consulting Engineers, Reykjavik, Iceland gudjonbj@almenna.is