634.Under normal weather conditions, when a vehicle is traveling on a freeway or expressway at a speed of90 kilometers per hour, the safe following distance between the vehicle and the one ahead is: (A) 45meters for large vehicles, 70 meters for small vehicles. (B) 70 meters for large vehicles, 45 meters forsmall vehicles. (C) 70 meters for both large and small vehicles.

642.When a vehicle breaks down and cannot be driven, it should be moved to a location that does notobstruct traffic. Regarding the handling of breakdown warning signs before or after the vehicle is moved,which of the following is incorrect? (A) On roads with a speed limit of 40 km/h or below, the sign shouldbe placed on the road surface 100 meters behind the vehicle; placement at an appropriate position infront of the vehicle may be set as needed. (B) On roads with a speed limit exceeding 40 km/h, the signshould be placed on the road surface between 30 and 100 meters behind the vehicle; placement at anappropriate position in front of the vehicle may be set as needed. (C) On congested road sections, thesign should be hung on the rear of the vehicle; placement at an appropriate position in front of the vehiclemay be set as needed.

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