Considering that the customers of Tollways have higher service level demands compared to the users of non-tolled motorways, a “Monitoring the success” action has been adopted by Attica Tollway. This “Monitoring the success” action is based on the development of a system for monitoring and analysing the trends of the outcome of an urban Tollway and it acts as a mechanism protecting the expected “value” that arises from the payment of  toll fee.  The major components of this action are the "Key Performance Indicators" (KPIs), which are based, to a great extent, on a multifunctional survey, in reference mainly to safety and customer service.