Explanation

"If you're making a long journey, plan a rest stop of 15 minutes for every two hours of driving. Motorway driving can be very tiring, especially for new drivers, and if you feel tired you'll need to find somewhere safe to stop. However, you mustn't stop on a motorway, hard shoulder or slip road except in an emergency or traffic queue. To find a safe place to stop, you'll need to leave the motorway at the next exit or stop at the next motorway service area."