It is a law that you need to keep a minimum distance from the vehicle in front (I guess it is 5 feetor so) so by keeping a distance, not only you follow the law but also ensure your vehicle does not gets damaged if the guy in front hasn't pulled up the handbrake or has a foot on the brake (happened to me several times, especially at Kalma chowk).
Also no matter how close you get to the car in front, 99% of motorcyclists would still try their 'skills' to somehow magically pass through so its a good idea to keep at least 5 feet distance which would minimize risk of any scratches from motorcyclists