The Harmonoise source model is analyzed based on Nordic data. The conclusion is that the Harmonoise source model is recommended with the following modifications and comments: • New speed coefficients have been derived from Nordic data and some other coefficients have been modified as well • Sweden, Norway and Finland get a regional correction for tyre/road noise to take into account different road surfaces and the use of studded tyres • The horizontal directivity of rolling noise is modified to fall in between that of Nord 2000 and Harmonoise • The correction for studded tyres has been modified • The temperature corrections of Harmonoise have been confirmed • The road gradient model for propulsion noise of heavy vehicles is verified