The ADMS-Roads pollution model is a comprehensive tool for investigating air pollution problems due to small networks of roads that may be in combination with industrial sites, for instance small towns or rural road networks.
ADMS-Roads combines many of the scientific capabilities of CERC's air quality management system ADMS-Urban with an easy-to-use interface. Model operation is similar to other ADMS models, making it a simple task for anyone familiar with ADMS 4 to extend their modelling skills to cover road sources.
http://www.cerc.co.uk/environmental-software/ADMS-Roads-model.html