Do not blink your lights expecting reciprocation. The only dim thing in the truck is the driver and the peg of illicit arrack he has had at the last stop; his total cerebral functions add up to little more than a naught. Truck drivers are the James Bonds of India and are licensed to kill. Often you may encounter a single powerful beam of light about six feet above the ground. This is not a super motorbike, but a truck approaching you with a single light on, usually the left one. It could be the right one, but never get too close to investigate. You may prove your point posthumously. Of course, all this occurs at night, on the trunk roads.