What does it mean when "TV" is put on the windows of vehicles in conflict areas?

Question

In the movie "Salvador" (1986) Richard Boyle puts "TV on the window of his car. At first I thought that he was advertising the TV he brought down with him, but then I saw it in "Blood Diamond" as well. I assume it has something to do with journalism, but I wuld like to know what it stands for and the frules of war regarding Vehicles marked in sucha manner.

Answer 1

So the combatants don't mistake the vehicle for the enemy and destroy it.