What might driving on an automated highway be like? The answer depends on what kind of system is ultimately adopted Two distinc

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问题    What might driving on an automated highway be like? The answer
depends on what kind of system is ultimately adopted Two distinctive 【S1】________
types are on the drawing board. The first is a special-purpose lane system,
which certain lanes are reserved for automated vehicles. The second is a【S2】________
mixed traffic system; fully automated vehicles would share the road with
particularly automated or manually driving cars. A special-purpose lane【S3】________
system would require more expensive physical modifications to existing
highways, and it promises the greatest gains in freeway capacity. 【S4】________
Under either schemes, the  driver would  specify  the  desired,【S5】________
destination furnishing it to a computer in the car in the beginning of
the trip. If a mixed traffic system was in the place, automated driving【S6】________
could begin whenever the  driver was on suitably equipped  roads.
Whenever special-purpose lanes were available, the car could join【S7】________
existing traffic in two different ways. One method would use a special
onramp. As the driver approached the point of entry for the highway,
devices installed on the roadside would electronically check the vehicle to
determine their destination and to ascertain that it had the proper【S8】________
automation equipment in good working order.
Either approach would harmonize the movement of new entering【S9】________
vehicles with those already traveling. Automatic control here should
allow smooth merging. And once a vehicle had settled into automated【S10】________
travel, the driver would be free to release the wheel, open the morning
paper or just relax.
【S4】

选项

答案and→but

解析连词错误。上文提到特殊用途的车道系统需要对现有公路进行较昂贵的物理修正。本行说它有望达到最大的容量。这两层之间是转折关系，而非并列关系。

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