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.
D) The driver should share the automated lane with those of regular vehicles.
24. We know from the passage that a car can enter a special-purpose lane .
A) by smoothly merging with cars on the conventional lane
B) by way of a ramp with electronic control devices
C) through a specially guarded gate
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