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Question
What is the purpose of rumble strips?
Answers
A.  They alert drivers to potential tire problems.
B.  They test a vehicle's shock absorbers.
C.  Through vibration and sound, they alert inattentive drivers to the fact that their vehicles have left the travel lane.
Explanation
Rumble strips create noise and vibrations to warn drowsy or inattentive drivers that they are straying off of the road or are approaching a stop sign or signal.
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This question's difficulty is Medium

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This questions appears in the following tests:
  Alabama Practice test 10  Alabama Practice test 19  Arizona Practice test 1  Arkansas Practice test 24  California Practice test 17  Connecticut Practice test 12  Delaware Practice test 18  District Of Columbia Practice test 18  Georgia Practice test 2  Iowa Practice test 4  Kansas Practice test 1  Kentucky Practice test 8  Kentucky Practice test 13
  Maine Practice test 8  Maryland Practice test 3  Mississippi Practice test 5  Nebraska Practice test 8  Nebraska Practice test 19  South Carolina Practice test 24  South Dakota Practice test 9  Tennessee Practice test 10  Wisconsin Practice test 24  Wyoming Practice test 20
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