Traffic Laws and Rules of the Road — Idaho Driver's License Practice Test

This Idaho Driver's License Traffic Laws and Rules of the Road practice set has 79 practice questions based on the official exam materials, each with an instant explanation. You need 85% on the real Idaho Driver's License knowledge test to pass.

Sample questions

Three questions from the Traffic Laws and Rules of the Road bank with the correct answer and an explanation. The practice quiz above draws 30 questions at random from the same bank.

1. Under Idaho's "basic rule" law, at what speed must you drive at all times?

   • A speed that is reasonable and prudent for the conditions — Correct answer
   • Exactly the posted speed limit at all times
   • As fast as the vehicle in front of you
   • At least 10 mph below the posted limit

   Explanation: Idaho's basic rule law requires you to drive at a speed that is reasonable and prudent at all times, considering traffic, road surface, hazards, visibility, oncoming traffic, curves, and other conditions.

   Handbook: Traffic Laws and Rules of the Road — Speed Limits

2. You are driving below the posted speed limit but so slowly that you impede the safe flow of traffic. What is true?

   • You are violating the basic rule law — Correct answer
   • You are always legal as long as you are under the limit
   • Slow driving is never a violation in Idaho
   • Only commercial vehicles can be cited for slow driving

   Explanation: If you drive too slow for existing conditions and impede the safe flow of traffic, even under the posted speed limit, you are violating the basic rule law.

   Handbook: Traffic Laws and Rules of the Road — Speed Limits

3. What is the maximum speed on Idaho interstates unless otherwise posted?

   • 75 mph — Correct answer
   • 65 mph
   • 55 mph
   • 85 mph

   Explanation: The maximum speed on interstates is 75 mph unless otherwise posted (80 may be allowed where posted).

   Handbook: Traffic Laws and Rules of the Road — Maximum Speeds