In urban areas, access and cost of parking are factors that affect car travel. Parking resistance is captured in today's version of Sampers only in a simplified form for Gothenburg and Stockholm. This simplified form has drawbacks that make the method unsuitable to implement on a larger scale. As a result, Trafikverket has identified in this project the need to investigate how parking resistance is implemented in other regional and national traffic models around the world. The purpose of the project is to make academic and applied knowledge available in Swedish to provide a knowledge base for how parking resistance can be implemented in Sampers.