Sample writing:

I live in a big city and there is always busy traffic on the streets. About 6.30 every weekday people often travel to work or to school in a hurry by bicycles, motorbikes and cars, so there is always heavy traffic. The same situation happens at 5.30 p.m. when everybody gets home. As a result, there are often traffic jams at the busy crossroads or roundabouts during rush hours. Heavy traffic also causes air pollution and we are trying our best to use bicycles and buses more often to save the environment.