根据所学常识判断下列说法是(√)否(×)正确。
( ) 1. There are always three lights: red, yellow and green.
( ) 2. It's not fast to go by plane.
( ) 3. If you go on foot, you don't need (需要) to know the traffic rules.
( ) 4. In the U.S, drivers drive on the right side of the road.
( ) 5. If the light is yellow, you can go.