Park and Ride (P&R) facilities have become increasingly popular in many European metropolitan areas. Despite its popularity, however, the real impact of P&R has been criticized by many who suggest that P&R can have little or even negative effects on car use reduction. This is mainly due to the so-called unintended effects, the most familiar being the “abstraction from public transport”; i.e., some P&R users had been making the whole trip by public transport prior the introduction of the P&R facility. This paper uses the findings of a users survey (N = 738) conducted in nine rail-based P&Rs located around the cities of Rotterdam and The Hague (The Netherlands) in order to get an overview of the impacts in terms of the vehicle km travelled (V...