US truckdrivers have long used this type of communication to tell other driver that his trailer has passed another rig, and is safe to merge back into the travel lane. 1) flash or turn off headlights when merge is safe. 2) after merging, truck either: flashes 4 ways, blinks clearance lights or momentarily puts directional on from side opposite the merge.
1) flash or turn off headlights when merge is safe.
2) after merging, truck either: flashes 4 ways, blinks clearance lights or momentarily puts directional on from side opposite the merge.