3. The higher the speed, the longer the braking distance. If the speed doubles, the required braking distance (A) doubles. (B) is 4 times greater. (C) is 8 times greater.

9. When changing lanes, in order to prevent accidents resulting from the blind spots, (A)use the turn signal in advance before turning, check through mirrors and turn your head around (B)focus on the traffic ahead (C)maintain a safe following distance from vehicle ahead.