Yikes! My sister just rang and told me that she and my niece had been driving along the A30 in Devon a couple of days ago when the car's engine suddenly cut out. The road there is a very busy dual carriageway. Sis managed to coast over to the left, then both of them scrambled up a grassy embankment to safety. They phoned for a breakdown truck, but that took 3 hours to arrive. After a few minutes a brave (but foolhardy?) motorist stopped and shouted that the dead car was in a very dangerous position and volunteered to push it up onto the embankment. He pretty much managed to get it off the road.
That could have gone very bad, very quickly!