Imagine you are walking around the city center. It is a warm summer evening and the street is deserted, no children or cars are around. The pedestrian light to cross the street is red. What do you do? Keep waiting for the light to turn green or just cross? And why? Because it is your own free choice? If you decided to ignore the red light and cross the street, you just broke what is called a social norm . Social norms help us to effectively respond to social situations. Not only do they help coordinate road users to safely cross the street, but they also tell us what ‘appropriate’ behavior is...