Some people like to drive back arrow. It saves travel time. This is due to the accident. So we should avoid driving back arrow will help keep accidental drop.
Some people like driving back to the arrow because it saves time. This is the reason that caused the accident. Therefore, we should avoid driving a car backward arrow gives up because of reduced dimensions.
Some people like a contraflow. Because it saves time in the trip, this is the result of an accident, so why should we avoid the drive contraflow will help, because of the reduced.