Around the middle of August, we were on our way to Reykjavik, when we encountered a long line of cars on the road. A truck had had an accident and no one could get through. After a while waiting in line, a cop turned everyone around and told us to take a back road around. It was 30 km on a 1,5 car wide gravel road - and it has probably NEVER seen so much traffic LOL We were not in a hurry, so we just enjoyed the scenic detour - but the jeep in front of us was rather impatient, so it was rather comical watching his frustration with the slow going traffic :)