Conversely, a lack of enforcement will typically see poor wearing rates. Also included in the intermediate outcome measures are 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 also 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.