I pulled into a French Service station,A10 south of Paris, on the exit was a HGV blocking the turn, waited about 15 minutes, decided that I could pull straight across the exit and reverse back into the 90 degree road to our left, but it took three trys due to a car blocking the reverse road. Managed to fully block the exit, with people watching, maybe 20 minutes, Police ended up there, helping to quell the incident, as nobody could get onto the motorway, just got the caravan , straight and ready to go and the Person munching his Garlic Baguette, blocking myd reversing, got into his Citroen and off. A good reversing day.