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Why can it be an advantage for traffic speed to stay constant over a longer distance?

A Your overall journey time will normally improve
When traffic travels at a constant speed over a longer distance, journey times normally improve. You may feel that you could travel faster for short periods but this won’t generally improve your overall journey time. Signs will show the maximum speed at which you should travel.
B You will do more stop-start driving
C You will use far more fuel
D You will be able to use more direct routes