[MadMax]

I’ve ridden shotgun numerous times with truckies on overnight runs. You may or may not have noticed it but at night they frequently flash their marker and/or decorative lights at each other as they pass in opposite directions. Usually those with minimal or standard lighting simply give a single flash on their right hand indicators as an alternative.

On a couple of occasions I’ve tried it in my car - giving trucks with extravagant lights a cheeky right hand blink of my indicators but of course this would never be interpreted the same way. The other night however I noticed they DO respond to blinks of your fog lights. YMMV.