The level of public support for a potential policy measure is an important consideration for policymakers for whether they will implement such a measure or not – or whether they should try to influence public opinion. It is important to understand what kind of arguments are being used by people when supporting or opposing particular policy measures. Recent research has demonstrated that it is possible to develop a typology of arguments in favour or against policy measures. The typology consists of four groups of arguments in favour and four “mirror” groups of arguments against policy measures. The categorization was developed by decoding and classifying the arguments used by road safety experts from five European countries, who were confronted with several controversial policy measures. Although the typology was developed in the context of road safety, it appears that it can be applied or expanded for use in other policy areas as well.