The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the highway. The driver will then be free to relax and wait for the buzzer

　　that will warn him of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,500 to 2,000 vehicles that can be carried by a present-day highway.

　　21. One significant improvement in the future car will probably be ________.

　　A) its power source

　　B) its driving system

　　C) its monitoring system

　　D) its seating capacity

　　22. What is the authors main concern?

　　A) How to render automobiles pollution-free.

　　B) How to make smaller and safer automobiles.

　　C) How to solve the problem of traffic jams.

　　D) How to develop an automated subway system.

　　23. What provides autos with electric power in an automated highway system?

　　A) A rail.

　　B) An engine.

　　C) A retractable arm.

　　D) A computer controller.

　　24. In an automated highway system, all the driver needs to do is ________.

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