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Here is some information from the Internet.
“The most common signal is used by cars and trucks in oncoming lanes. They will double-flash their headlights when they just passed a police speed trap that you’re heading toward.
“More than two consecutive flashes from oncoming traffic signals that there is another type of danger ahead, such as a foreign object on the road and drivers should proceed with caution. These two signals are often confused, but the appropriate action is the same, slow down.
“Another signal is for lane change clearance. Because semi-trucks are so long, it can be difficult for the driver to tell if he can safely change lanes in front of you. You can quickly flash your headlights when his trailer clears your car and there is room for him to move back into the driving lane (as appose to the passing lane).
“Truck drivers will put their flashing hazard lights on when the highway traffic is coming to an abrupt stop.”
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