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

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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