Either approach to joining a lane of automated traffic would harmonize the movement of newly entering vehicles with those already traveling. Automatic control here should allow for smooth merging, without the usual uncertainties and potential for accidents. And once a vehicle had settled into automated travel, the driver would be free to release the wheel, open the morning paper or just relax.
21. We learn from the first paragraph that two systems of automated highways .
A) are being planned C) are now in wide use
B) are being modified D) are under construction
22. A special-purpose lane system is probably advantageous in that .
A)it would require only minor changes to existing highways
B)it would achieve the greatest highway traffic efficiency
C)it has a lane for both automated and partially automated vehicles
D) it offers more lanes for automated vehicles
23. Which of the following is true about driving on an automated highway?
A)Vehicles traveling on it are assigned different lanes according to their destinations.
B)A car can join existing traffic any time in a mixed lane system.
C) The driver should inform his car computer of his destination before driving onto it.
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