Since the cars were invented and were driving the roads, car accident always happened. During the inquiry about the world’s first traffic death in 1896(just 11 years after cars were invented), the coroner said ‘this must never happened again’. More than a century later, 1.2 million people were killed on roads every year and up to 50 million were injured. These casualties of the road will increase if the action is not taken. One of the main reasons of the death of the young people around the world is road accident. In 2004, the number of people who died in accidents increased from 0.99 million (in 1990) to 1.2 million people (in 2002). About 85%~90% of the dead are from less-developed countries. From 1975 to 1998, the accident death rate in Canada, Sweden and U.S. had been decreased 63.4%, 58.3% and 27.2%. At the same time, the accident death rate in Colombia, China and Botswana had been increased 237.1%, 243% and 383.8%.
So, now, when we are designing cars, one of the most important parts of the car is the safety system. I will list some safety features that protect the drivers and passengers.
First, and the most common safety feature, seat belt. Seatbelt or safety belt is a safety harness, which is designed to secure the occupant of a vehicle against harmful movement (that may result from a collision or a sudden stop). As part of a passive safety system, seat belts are planned to reduce injuries by stopping the wearer from hitting hard elements of the vehicle, or other passengers (so-called second impact). Seatbelts are placed in the correct position for the airbag to deploy and prevent the passenger from being thrown from the vehicle. Seatbelts also absorb energy as designed to stretch during any sudden bracking, so that there is less speed difference between the passenger's body and the vehicle, and also to spread the impact on the passenger’s body(due to 3-point connection).
Seat belts are responsible for