Mex-Ams are the worst drivers: A large sample of Americans (8,517) was asked by the General Social Survey if they had ever been given a traffic ticket. I calculated the percent who answered "yes" for every ethnic group with at least 100 respondents:
Percent who ever received a traffic ticket
Some of the pattern might be explained by where you live: people of English, German, Scottish, Norwegian, or Amerindian ancestry are disproportionately rural/small town/suburban--areas where people drive a lot. But this does not get Mex-Ams off the hook. They tend to be urban: Seventy-two percent live in more populated areas, compared to 62% of Americans.
And take notice of all those African Americans who are being ticketed for "driving while Black."