After a vehicle enters a mountain road, it should  pay special attention to the “continuous curves) sign. In addition, it should  voluntarily evade vehicles and pedestrians, reduce speed in a time manner  and honk in advance. Answer:  √

When an accident has caused congestion on an expressway, the vehicles may run in the emergency strip on the right or in the shoulder of the road. Answer:  ×

When a vehicle changes lane, the driver should  turn on the turn signal in advance, observe,keep a safe distance and enter the new lane. Answer:  √

A vehicle running on an expressway may frequently change lanes. Answer:  ×

When a vehicle runs on an expressway at the speed of 100km/h,the safe distance from vehicle ahead is 100m. Answer:  √