Dan Ariely wrote The Honest Truth about Dishonesty. Want to know what that truth is? We all break the rules. Doesn't really matter what background or culture. BUT we only do it a little - only to a degree that we can get away with it and still sleep at night. We all slightly fudge the numbers in our tax reports, we all slightly go over the limit, because rules are suggestions when we think we have more than enough reason to make an exception this one time. Road designers know this, and take it into account: Fun fact about consultancy: usually, you get paid by the hour and you need to round the hours worked to whole or half hours. Pretty much everyone rounds up and nobody rounds down. As a result, everyone gets paid slightly less per hour worked than they should if everyone was honest. So if you are the only fully honest person you're the idiot who gets paid the least. Label me 'Neutral Evil', but I'm not going to be that idiot. (P.S. that Wiki stub is a terrible article. Yuck.)