i agree, in fact the small cars will be targeted and i noticed the difference when i used a lancer rented car when most of the LCs didn't care about me on the road, but fortunately now i have a big car and rarely someone will flash for me from the back.
In my opinion the action should be taken not only by increasing the number of the speed radars coz it's not an issue of speed only, the solution should be spreading sort of secret agents in the streets with small cars and let them report the number plate of the rude and careless drivers and take action against them accordingly.