The Harmonoise sound propagation model ('the Harmonoise engineering model') was developed in the European project Harmonoise (2001-2004) for road and rail traffic noise. In 2008, CSTB Grenoble and TNO Delft have prepared a detailed description of the various steps involved in a calculation with the Harmonoise model. In the course of this joint project, some elements of the model were further improved. In 2009, test calculations were performed with the model, and results were compared to results of other models. In this paper calculation results are presented for situations with noise barriers. A basic approximation of the Harmonoise model is the linearization of the sound speed profile in the atmosphere. The effect of linearizing the complex wind profile near a noise barrier is investigated by comparison with numerical calculations with a parabolic-equation wave propagation model. Comparisons with the Nord2000 model are also presented.