Transport policies that aim to affect behaviour, e.g. by altering travel routes, distance, modes, frequency, or schedules, can accomplish this through either "push" or "pull" measures. Although they do not have to be monetary in nature, most often these measures come in the form of pricing measures, involving either costs for non-compliance (push) or monetary rewards for compliance (pull). The potential for such measures to have unintended behavioural effects (e.g. rebound effects), however, should also be recognised and addressed.