>>The purpose of a speed limit is to make driving safe...<<
"I hoped that the national 55-mile per-hour speed limit--already in force--would help reduce gasoline consumption"
http://www.presidency.ucsb.edu/ws/?pid=8017
>>When conditions make 55 unsafe, people need to slow down enough to be safe...<<
"California has a 'Basic Speed Law.' This law means that you may never drive faster than is safe for current conditions"