单选题 Some pessimistic professors feel a little worried that mobile won't be useful in the near future. They see a day when all vehicles will be abolished. Other authorities, however, argue that the transportation will remain a leading way of urban travel in the foreseeable future.
The motorcar will undoubtedly change significantly over the following 30 years. It should become smaller, safer, and more economical. What's more, the future car should be more pollution-free than current kinds,
Without regarding its power source, the auto in the future will still be the main problem in urban traffic congestion(拥挤). One key to this issue is the automated high-speed system.
As the auto enters the highway system, a retractable (可伸缩的) arm will drop from the auto and make contact with a rail. For the time it attaches to the rail, the vehicles will get electrically powered from the system, and control of the vehicle will pass to a central computer. The computer wilt then monitor all of the car's movements.
The driver will use a phone to dial instructions about his terminal into the system. The computer will search for the best route, and show the right exit from the highway. It is estimated that an automated highway will be able to process 10,000 vehicles per hour.