Carrying out the census of advertising billboards is an activity that all road owners should carry out. It is a good practice as it allows the owner body to have the following data available in a clear and precise way:

•  number of advertising signs installed
• typology
• size
• property
• annuity.

The census of advertising billboards is a useful tool for checking that the directives on advertising are respected and it also makes it possible to verify if there are situations of evasion or illegal use.