Think you know when your fine to drive?

It is impossible for drivers to assess their own impairment because alcohol creates a false sense of confidence and means drivers are more inclined to take risks as they believe they are in control when they are not.

It is also impossible to calculate how much alcohol you have in your blood (even if you know exactly how much you have consumed), or how long it will stay in your system. The speed at which alcohol is absorbed into your system (and how quickly your system gets rid of it) depends on a large number of factors, including your sex, weight, metabolism, health and when you last ate.

Lock up poster