For awhile I worked for a company that did on site repair and maintenance on equipment. They assigned work the day before and often techs would be given jobs 100 to 150 miles from the office and the policy was you started your day at the first job. So a tech would drive and hour plus off the clock.
One of the employees took them to the Labor Board and won. They had to pay back wages and the new policy was you started and ended your day at the office.
I think those type of rulings have impacted other companies. Last company I worked for would even pay your travel time to the airport if you were traveling.
George Orwell wrote of Brit miners in the '30s not starting to earn their pay until they got to the actual coal digging site - sometimes having to walk a mile in the tunnel to get there.