Heavy fine should be imposed to tail gaiting. I think the speed radar technology can be also used to detect tail gating or cars not respecting safety distance. speed radars can detect the cars passing by a single point, so the interval between 2 cars can easily determine their distance and the car behind should be heavily fined.
Tail gating is extremely dangerous more than speeding. Slow cars on the left lane should not be a excuse for tailgating or flashing lights. In an ideal world, the left lane should be used only to overtake, but this is not the case in many parts of the world and UAE is not an exception, ultimately tailgating or lights flashing is not a solution for this and it is an instigation for an accident and this must be avoided.