Idaho permit test: speed limits & control

Posted and basic speed laws, statutory limits and adjusting speed to conditions. 6 questions.

Question 1 of 6
Speed limits & controlIdaho rule

Unless a different limit is posted, what is the maximum speed in an Idaho residential, business or urban district?

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Sample speed limits & control questions

  1. Unless a different limit is posted, what is the maximum speed in an Idaho residential, business or urban district?

    • A 35 mph
    • B 25 mph
    • C 30 mph
    • D 45 mph
    Show answer

    A. 35 mph

    Idaho's default maximum in any residential, business or urban district is 35 mph unless signs say otherwise. Lower limits are often posted, especially near schools.

    Source: Idaho Driver's Handbook, page 68

  2. Unless otherwise posted, what is the maximum speed on an Idaho interstate?

    • A 65 mph
    • B 70 mph
    • C 80 mph
    • D 75 mph
    Show answer

    D. 75 mph

    The Idaho interstate default is 75 mph unless otherwise posted, and 80 mph may be allowed where posted. State highways default to 65 mph, with 70 allowed where posted.

    Source: Idaho Driver's Handbook, page 68

  3. Unless a higher limit is posted, what is the maximum speed on an Idaho state highway?

    • A 55 mph
    • B 70 mph
    • C 75 mph
    • D 65 mph
    Show answer

    D. 65 mph

    Vehicles may not exceed 65 mph on Idaho state highways, though 70 mph may be allowed where posted. Always obey the posted limit and adjust for conditions.

    Source: Idaho Driver's Handbook, page 68

  4. You drive 40 mph in a 65 mph zone on a clear day, holding up a long line of traffic. Under Idaho's basic rule, is this a problem?

    • A No, driving below the limit is always legal
    • B No, as long as your hazard lights are on
    • C Yes, driving too slowly and impeding traffic violates the basic rule
    • D Only if you are on an interstate
    Show answer

    C. Yes, driving too slowly and impeding traffic violates the basic rule

    Idaho's basic rule requires a speed that is reasonable and prudent at all times. If you drive too slowly for conditions and impede the safe flow of traffic, you violate the basic rule even while under the posted limit.

    Source: Idaho Driver's Handbook, page 68