For example, if police in a particular location are rigorously enforcing the use of restraints, restraint wearing rates will rise. Conversely, a lack of enforcement will typically see poor wearing rates. Intermediate outcome measures also include independently conducted public surveys that will test the perceived likelihood of being caught speeding, belief that an individual can predict where a compulsory breath testing checkpoint will be and admissions of drink driving. These survey measures provide valuable feedback to police on how effective their operations are in changing public attitudes and behaviours that cause or worsen road trauma. It is important to compare offence detection rates with known offending rates. As enforcement of given offence types rise, actual offending rates will fall.