Yes, Its very important to fasten seat belt once you enter the car. When you go for driving test also, first thing u do is put seat belt. Recently (Last week) one of my friend's car met with an accident. There were another two guys with him. One of was sitting in the back seat of course without seat belt. And the front tyre bursted and the car took a sharp turn and went off the road. The persons in the front seats were unhurt as they had their seat belts on. But the man sitting behind was seriously injured. So this tells us ' the traffic rules are meant for OUR SAFETY'.

Thanks