Science and technology have made great advances in the prevention of car accidents, but human behavior is the ultimate limit on what both can do to prevent them. Road design has improved as a result of science and the timing of traffic signals is another example of how science is applied to this problem. In years past, there was no delay at all on the opposing light, meaning that there were more accidents when people tried to go through the yellow light. The curves of roads and the entrances and exits to freeways are all safer today because of science. The improvement of braking systems and the new sensors on cars, which I believe detect when another car is near, are other examples. Some municipalities have a system whereby emergency vehicles can control the lights, turning all lights red as they approach an intersection, so they can proceed through safely and avoid accidents. I also remember reading about locking systems that require sobriety before a car can be unlocked or started, and while I'm not sure how many cars actually have this, it is yet another instance in which science can be applied to prevent accidents. Some private companies and public transportation companies equip their vehicles with a "governor" that prevents the driver from driving over the speed limit, which surely brings down the accident rate. Nevertheless, it is difficult to know how science can always prevent people from driving in an unsafe manner,
1)In physics while taking sharp turns we can prevent the car from slipping at high speed and reduce its dependence on friction by BANKING OF ROADS. in this the road is slightly tilted by an angle so that a component of normal reaction can help to provide the centripetal force.
2) Also the engines have been designed in such a way that even if there is a head on collisiion there is minimum probability of fire or fuel leakage causing road accidents.