This article compares different strategy options for providing bus priority at traffic signals. The different strategies considered vary in the streng th of the priority awarded and in the selection of the buses that are to receive priority. The strategies include so- called differential priority, where buses receive individual pr iority treatment according to some criterion such as lateness, and nondifferential pri ority, where all buses are treated in the same way. The strategies are compared using a simulation model, SPLIT, that has been developed and validated by the authors. The article describes some o f the modelling issues that are involved in simulating bus priority systems and how they have been treated within the SPLIT model.