So you're in lane 2 overtaking lorries at 70, when all of a sudden you notice lane 1 has slowed significantly but lane 2 is still going along at 70. You need to get into lane 1 which is now standstill, the cars in front and behind you all clearly want to do at least 50 still. How do you safely get into the first lane? Bear in mind this is still over 2 miles from the exit. No signs had yet shown it's all traffic from people that obviously drive the route daily and expect this situation.