Question When driving in Idaho, you must: Answers Always drive at the maximum posted speed limit. Drive at a speed that is reasonable and prudent at all times. Drive 10 mph below the posted speed limit at all times. Always drive at the same speed as the vehicles around you. Explanation Idaho law requires you to drive at a speed that is reasonable and prudent at all times. Decrease your speed any time conditions are less than perfect for driving. Take a FREE Practice Test Now This questions appears in the following tests: Idaho Practice Test