Why do people drive quite new motorhomes at 50 mph on busy motorways? I've travelled 50 miles or so on the M4 the last couple of Friday afternoons and have been surprised how many newish motorhomes I've passed going along at about 50 mph. Slow enough that there is a line of lorries overtaking them. My van is 25 years old but is still happy at 60, I generally trundle along at about 56 so as not to have to overtake too many artics, I would hate to be continually overtaken by them. My works transit will happily do 80mph fully loaded so why so slow? It's hardly because the driver is enjoying the scenery!