Reference: http://www.alfawzan.af.org.sa/node/14756
Question: Is exceeding the speed limit set by the traffic authority for road safety considered a violation of the authority of the leader?
Response: Whether it has been limited or not – speeding which entails danger to you and the people is not permissible; that is because it is from the causes of death for you and others, so it is not permissible to increase the speed beyond what is normal, and which would be a cause of danger.