a signal, always consider the surrounding traffic situation. A brief flash of headlights can have a different meaning at another time or in another circumstance.
Before treating a flash as an invitation to change lanes, there is one important distinction every driver should remember: an informal signal is not the same as official permission.
It Is Not Official Permission to Change Lanes
A brief flash of headlights does not legally give you permission to change lanes or establish that you have the right of way. At most, the driver behind you may be indicating that they appear to have enough space or that they can see you have completed the overtaking maneuver.
That distinction is important. Always continue checking your mirrors and the surrounding traffic before moving to another lane. Maintain an appropriate distance from the truck and avoid cutting directly in front of it.
Heavy vehicles generally require more
