Externalities are often used to measure economic impacts of traffic (e.g. cars and trucks) and play a crucial role in road pricing and cost-benefit analysis. However, due to a recent emissions scandal, we now know that the latest externality parameter values are unreliable. The aim of this PhD project is to measure and quantify externalities for WA. Properly measured and quantified externalities ensure that the costs to society are measured and quantified properly. For more information contact Sae Chi.