Today, most people in the city rely on automobiles as a means of transportation. While many people still take the city buses, more and more are driving to work every in their own cars. To many city dwellers, cars have become a necessity. But too many cars in the street also create problems. Traffic congestions, accidents and air pollution are the three most obvious problems that accompany a sharp increase of cars.

We often get caught in heavy traffic during the rush hours, when it takes a long time to move forward even an inch. And thousands of people die while a greater number are injured, some crippled for life, in traffic accidents every year. If we want to enjoy our cars in safety, we had better follow the traffic rules carefully.