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.