Abstract
This paper models the endogenous frequency of shopping in a linear town, for the case where the costs of travel are affected by the degree of congestion along the road to the centre caused by other households travelling to shop, and where the costs of parking are also affected by the degree of congestion in the available car parking. A simple model of rival shopping centres is used to illustrate trip diversion, as well as trip generation, when the parking provision of one centre is improved. (Author/publisher).