In America you see that all the time. Drivers stopping to check directions or to adjust/check their load but in this game it's not that rare to come across a gas station or truck stop you can pull over to. I've never come across a driver who didn't park enough off the road so they don't block the lane but the problem I have is when convoys do it while they're waiting for other members to catch up. They tend to all pull out at once as well. At least with a truck stop you get the room to get up to a good speed before entering the motorway. It's more of a courtesy thing to find a truck stop.