While the main role of traffic regulations enforcement is clear cut the efficiency of different enforcement activities is very seldom evaluated. Monitoring enforcement implies monitoring the actual levels of non compliance and assessing the enforcement oprations on road users' behaviour and on overall traffic safety. The paper presents the work carried out within the framework of the EU-project ESCAPE. The intentions was to develop a backgrond for the synthesis of guidelines fro monitoring routine police enforcement based on practical measures of non compliance in driver behaviour and other available data. Overviews of methods in use for monitoring police enforcement efficiency were carried out. A review of regular surveys for the systematic evaluation of road user behaviour were made. Relevant methods and tools were identified. The findings were finally synthesized into guidelines for monitoring routine police enforcement.