Congestion pricing has been successfully implemented in several cities in the industrialised world, including Singapore, London, Stockholm, and Milan. Those systems are reliant on an extensive institutional framework, including databases of vehicles and personal identities, electronic payment channels, and perhaps most importantly, a cost effective method for ex post debt collection. In a context where such institutional support is weak, e.g. a developing nation or a road network with a large share of international traffic, the existing framework is not fully applicable. This paper suggests a conceptual model for solving these challenges, based on the simple assumption that visiting vehicles will eventually come back to the system, and can be enforced on site when they do. As part of the concept, the vehicles themselves are used as collateral for any unpaid tolls, and the operator is actively selecting which vehicles to target when optimizing enforcement operations. For this conceptual model to function consistently, a few design requirements are identified, related to the technical construction as well as the charging rules and the underpinning legal framework. A formal model is proposed, and finally, the model is implemented in a simulation environment and is calibrated to get an order of magnitude estimate of the most important parameters and the potential benefits of the system.
2012. , 28 p.