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Most-missed Montana DMV rules
These are the numbers and rules that trip up new drivers most often on the real Montana knowledge test. Every fact below comes from our free Montana DMV practice test question bank, which has 180 questions across 9 topics.
Speed limits
- Montana's manual sets interstate limits for cars/light trucks at 80 mph both day and night, with no nighttime reduction.
- Urban-area interstates drop to 65 mph for cars, lower than the 80 mph open-interstate limit.
- State highways carry a day/night split, 70 mph day and 65 mph night for cars, unlike interstates which stay flat.
- Urban Districts don't have one fixed number; posted signs typically show something in the 25-45 mph range.
- Montana keeps a flat 80 mph limit for cars/light trucks on interstates around the clock, one of the highest and least variable limits nationally.
- Heavy trucks are limited to 70 mph on open interstates while cars may travel 80 mph.
- On other public highways, the default speed limit is 70 mph in daytime and 65 mph at night.
- Montana law defines daytime as one-half hour before sunrise to one-half hour after sunset, with nighttime being any other hour.
Right of way
- When vehicles stop simultaneously at a four-way stop, the driver must yield to the vehicle approaching from the right.
- At uncontrolled intersections, drivers must yield to vehicles approaching from their right.
- A driver turning left must yield to oncoming vehicles continuing straight through the intersection.
- Montana's manual requires drivers exiting alleys, driveways, or parking areas to stop and yield to roadway traffic.
- Entering drivers must yield to vehicles already circulating in the roundabout.
- The vehicle that stops first at a four-way stop generally has the right of way to proceed first.
- A traffic officer's directions take precedence over conflicting signs or signals in standard right-of-way practice.
- Controlled intersections are those regulated by signals, yield signs, or stop signs, as opposed to uncontrolled intersections.
- Drivers must always yield and come to a complete stop for pedestrians who are blind or vision-impaired.
- Do not cut through or break up a funeral procession. Slow down, be patient, and let it pass. Cutting between the vehicles is unsafe and often illegal.
- At an uncontrolled intersection, slow down and yield to any car already in the intersection or approaching from your right.
- A left-turning vehicle must yield to oncoming through traffic and to pedestrians. Only turn when the gap is safe.
- When entering a roundabout, yield to traffic already circulating and travel counterclockwise. Exit at your street; do not stop in the middle of the circle.
- At a T-intersection, traffic on the road that ends must yield to traffic on the through road that continues.
- A round green light allows a left turn but does not give you the right of way. Pull into the intersection, yield to oncoming through traffic and pedestrians, then turn when there is a safe gap.
Alcohol and DUI
- Montana's per se DUI limit for drivers 21 and older is a BAC of 0.08% or more.
- Montana applies a much stricter 0.02% BAC threshold for drivers under 21, described in the manual as far lower than the adult limit.
- The 0.02% threshold functions as a strict near-zero-tolerance rule for underage drivers, far below the 0.08% adult limit.
- Because drivers under 21 face a 0.02% BAC threshold, a 0.03% result exceeds that stricter limit and constitutes a DUI violation.
- Commercial motor vehicle drivers in Montana are subject to a stricter 0.04 BAC threshold.
- Aggravated DUI is triggered by a BAC of 0.16 or more, an interlock order violation, a suspended license from a prior DUI, or refusal of a breath test after a prior suspension within 10 years.
- By statute, this violation carries a fine capped at $100, is not criminal, cannot appear on a driving record, and insurers may not raise premiums because of it.
Signals and markings
- A flashing red signal requires a full stop, after which the driver may proceed when it's safe, just as at a stop sign.
- A flashing red signal functions like a stop sign, requiring drivers to come to a complete stop before proceeding when it is safe.
- A steady yellow light warns that the signal is about to change to red, so drivers should slow and prepare to stop if it is safe to do so.
- When a signal is dark or malfunctioning, drivers must treat the intersection as a four-way stop, coming to a full stop and yielding to the vehicle on the right if both arrive at the same time.
- The manual instructs drivers not to change lanes once inside a roundabout.
- The manual requires dimming high beams for oncoming traffic to avoid blinding other drivers.
- A flashing yellow signal warns drivers to slow down and proceed carefully through the intersection, unlike a dark signal which is treated as a stop.
- A bike box lets cyclists position ahead of traffic; drivers must stop behind the box rather than within it.
- A flashing yellow signal is a caution indicator meaning drivers may proceed but should do so carefully.
- A steady yellow light warns that the right of way is ending and the signal is about to turn red.
- A flashing yellow signal means drivers may proceed but should slow down and use extra caution.
- A flashing yellow arrow is a permissive signal allowing a left turn, but only after yielding to all oncoming traffic and pedestrians/cyclists in the crosswalk.
- A dashed yellow centerline indicates passing is permitted on that side, provided it can be done safely and there is no oncoming traffic conflict.
- A flashing yellow signal warns drivers to slow down and proceed carefully, rather than requiring a full stop.
- A dashed yellow center line indicates passing is generally permitted when it can be done safely, unlike a solid yellow line.
- A flashing red signal functions the same as a stop sign, requiring drivers to stop completely and then proceed only when it is safe.
- A dashed yellow centerline indicates passing is generally allowed on that side when it is safe to do so and no other restriction applies.
- A flashing red signal is treated the same as a stop sign: come to a full stop, then proceed only when it is safe.
- A broken yellow line on your side permits passing when safe, while a solid yellow line on your side prohibits passing, a standard center-line marking convention drivers must recognize.
- A steady red light requires a full stop; cross traffic has the right of way until the light changes.
- On a plain green light, a left-turning driver must yield to oncoming traffic and pedestrians before completing the turn.
- A flashing yellow light means slow down, look, and proceed carefully. It does NOT require a full stop the way a red light or STOP sign does.
- A flashing hand or countdown means do NOT start crossing. If you are already in the crosswalk, keep going and finish crossing safely.
- A steady DON'T WALK hand prohibits starting to cross. Only a WALK signal or walking-person symbol allows you to begin crossing.
- Always signal continuously through a turn or lane change even when you see no other cars, because pedestrians or cyclists may be near. Cancel the signal after you finish.
- A green downward arrow means the lane is open for you to use. A red X above the lane means it is closed and you may not drive in it.
- Double solid yellow lines separate opposing directions and prohibit passing. You may only cross them for a permitted left turn or a legal U-turn into an intersection or driveway.
- A broken yellow line on your side of the lane allows passing when it is safe. The solid line on the opposite side means that direction may not pass.
- White lines separate lanes going the same direction. A solid white line means stay in your lane and avoid changing lanes, while a broken white line lets you change lanes when safe.
- A two-way center left-turn lane is only for preparing to turn left or merging into traffic. You may not use it to drive straight through or to pass.
Parking
- Even without posted signs, basic parking rules like not blocking driveways, hydrants, or intersections still apply.
Safe driving
- Montana's manual highlights wildlife-crossing hazards on rural highways bordering unfenced ranch and farmland as a core defensive-driving concern.
- Montana's manual gives heavy emphasis to wildlife-crossing hazards due to its rural highways running through unfenced ranch and farmland.
- Farm equipment is common on Montana's rural highways, and drivers should only pass in a legal zone once the way ahead is clearly visible and safe.
- Heavy trucks need more distance to stop and have larger blind spots, so extra following distance improves safety.
- Given Montana's open-range law, livestock have the right of way, so drivers must slow and be ready to stop.
- Defensive driving calls for slowing down and preparing to stop when visibility of intersection controls is uncertain.
- Rural highways through unfenced farm and ranch land require extra alertness for livestock and wildlife crossing the road.
- Every occupant in the vehicle must be wearing a seatbelt or otherwise properly restrained, and the vehicle cannot carry more occupants than it has seatbelts.
- Sudden braking or sharp steering after a blowout can cause loss of control; easing off the gas while steering straight is safer.
- Drivers must stop for a school bus with flashing red lights and remain stopped until the lights stop flashing, protecting children crossing.
- The safe response to a skid is to ease off the gas and steer smoothly in the direction you want to travel, rather than braking hard or overcorrecting.
- General right-of-way practice, reflected in the manual, is that the first vehicle to arrive and stop proceeds first; simultaneous arrivals yield to the right.
- The manual warns that leaving a large vehicle's wind-sheltered draft can expose your car to a sudden crosswind push, requiring a steering correction.
- A several-second following distance, often cited as at least 3 seconds under normal conditions, provides reaction time to avoid rear-end collisions.
- Drivers in both directions on an undivided road must stop for a school bus with flashing red lights until it is safe to proceed.
- A time based following distance, counting seconds behind the vehicle ahead, adjusts naturally for speed and is the standard safe driving practice.
- Posted speed limits are for ideal conditions; drivers should reduce speed further and increase following distance in poor weather like heavy rain or fog.
- A 3 to 4 second following distance gives drivers enough time to react and brake safely under normal conditions.
- Endangering a highway worker with no injury results in a fine of $500 to $1,000, rising to as much as $5,000 if great bodily injury results.
- The manual requires headlights to be on whenever visibility is under 1,000 feet.
- Easing off the gas and holding a straight steering direction allows the tires to regain contact with the road surface safely.
- Safe lane changes require checking mirrors, checking blind spots by looking over the shoulder, and signaling the intended move before moving over.
- Hydroplaning occurs when water accumulates faster than tire treads can disperse it, causing loss of contact with the road.
- A driver overtaking a bicyclist may not turn right unless it can be completed at a safe distance from the cyclist and at a reasonable, proper speed.
- The manual advises reducing speed for wet roads, reducing it further for packed snow, and slowing to a crawl on ice, since traction decreases as conditions worsen.
- A minimum 3-second following distance gives drivers enough time to react to sudden braking by the vehicle ahead.
- Passengers under 2 years old must specifically be secured in a rear-facing child restraint system.
- A minimum three-second following distance under normal conditions gives a driver time to react and brake safely, with more time needed in poor weather.
- With a tailgater, open up more space in front of you so you can brake gradually instead of suddenly. Do not brake to retaliate and do not race away.
- Strong crosswinds can push your car out of its lane. Hold the wheel firmly with both hands, slow down, and be ready for sudden gusts.
- Do not engage. Avoid eye contact, do not brake in retaliation, let them pass, and leave a safe distance between you and that car.
- Horses and livestock spook easily. Slow down, do not honk or rev your engine, and pass very slowly with plenty of room so you do not startle them.
- When you see a hazard developing ahead, cover the brake and plan an escape route so you can react faster if you have to stop.
- In a skid, ease off the gas or brake and steer gently in the direction you want the front of the car to go. Slamming the brakes makes the skid worse.
Road signs
- School zone warning signage in Montana is five-sided (pentagon-shaped) and may indicate a reduced speed area near a crossing.
- Speed limit signs are standard rectangular white regulatory signs, distinct from the diamond-shaped yellow warning signs.
- Yellow diamond signs are warning signs alerting drivers to hazards or changing road conditions ahead, such as curves or crossings.
- Rather than one fixed statewide school zone speed, Montana's manual points drivers to posted signs that may show speeds as low as 15 mph depending on location.
- STOP (R1-1): full stop at the line or crosswalk even when empty; yield, then proceed.
- YIELD (R1-2): give up the right-of-way; slow and be ready to stop.
- DO NOT ENTER (R5-1): entry prohibited; common at freeway off-ramps and one-way streets.
- WRONG WAY (R5-1a): you have entered opposing traffic. Pull over safely and turn around when possible.
- ONE WAY (R6-1): all traffic flows in the arrow's direction.
- NO U-TURN (R3-4): no U-turns at this location. This is not a no-left-turn sign (a different arrow shape) or a no-passing sign (a different shape and color entirely).
- NO LEFT TURN (R3-2). A red circle-and-slash always bans the pictured movement.
- NO RIGHT TURN (R3-1): no right turns, including on red. Going straight is still fine since the sign only bans the right-turn movement; parking is unrelated to this sign.
- White/black = regulatory. Speed Limit is the legal max in ideal conditions; drive slower when conditions are bad (Basic Speed Law).
- KEEP RIGHT (R4-7): a median or obstruction is ahead; keep to its right.
- The crossbuck (R15-1) stands at the tracks and legally works like a YIELD sign: slow, look both ways, be ready to stop.
- Advance warning (W10-1): tracks ahead. Slow down, look, and listen.
- School (S1-1): school zone or crossing. Slow down and watch for children; obey the posted reduced school-zone speed limit, which varies by state.
- Pedestrian crossing (W11-2): crossing ahead; slow and be ready to stop.
- Signal ahead (W3-3): an intersection signal is coming, useful when it hides behind a curve.
- Stop ahead (W3-1): a stop sign is coming (often obscured); start slowing now.
- Merge (W4-1): traffic joins ahead. Adjust speed and position to let them in safely.
- Lane ends (W4-2): merge early; zipper-merge when traffic is heavy.
- Two-way traffic (W6-3): you are leaving a one-way road; keep right.
- Divided highway begins (W6-1): directions separate around a median; always keep right of it.
- Slippery when wet (W8-5): slickest in fresh rain. Slow down, keep distance, steer smoothly.
- Curve (W1-2): slow BEFORE the curve; do not brake in the middle of it.
- Turn (W1-1): sharper than a curve; slow down hard, follow the advisory plaque.
- Winding road (W1-5): consecutive curves; hold a steady lower speed throughout.
- Crossroad (W2-1): an intersection ahead with traffic entering from both sides. Hospital signs are blue with an H.
- NO PASSING ZONE (W14-3): unique pennant shape, posted on the LEFT side, marks where passing becomes illegal.
- School zone and school crossing signs use a distinctive fluorescent yellow-green pentagon shape to stand out to drivers.
- The octagon shape combined with red coloring is reserved exclusively for stop signs, requiring a full stop.
- Diamond-shaped yellow signs are the standard shape/color combination used for general warning signs about upcoming hazards or conditions.
- A circular sign with a diagonal slash through it is used nationally to show that a prior restriction (like a speed limit) no longer applies.
- Diamond-shaped yellow signs are standard warning signs alerting drivers to hazards ahead, such as curves, merges, or intersections.
- The eight-sided red STOP sign requires a full stop before entering the intersection, regardless of visible cross traffic.
- Yellow warning signage in this context provides an advisory safe speed recommendation for hazards like curves, distinct from a legally binding limit.
- Diamond-shaped yellow signs are warning signs, alerting drivers to hazards like curves, merges, or crossings ahead.
- The manual specifies reduced speed limits apply at locations marked with a School Crossing sign when children are present.
- The triangular yield sign shape signals drivers to give the right-of-way as needed to other traffic or pedestrians.
- Regulatory signs like stop and yield signs establish legally mandated driver actions, distinct from purely informational or warning signage.
- Diamond-shaped yellow signs are warning signs, alerting drivers to hazards or changes in road conditions ahead.
- White rectangular signs with black lettering are the standard shape and color used for regulatory information like speed limits or turn rules.
- Drivers must stop at the marked line or crosswalk, or at the edge of the intersection if there is no marking, before proceeding.
- The handbook instructs drivers at yield signs to slow down and yield to vehicles already in the intersection or approaching.
- The octagonal red stop sign universally requires a full stop before the driver may proceed when safe.
- A stop sign requires a complete stop, regardless of whether other vehicles or pedestrians are present.
- Warning signs (typically yellow, diamond shaped) inform drivers of hazards ahead like curves or crossings, distinct from regulatory signs that state legal requirements.
- The yellow pennant-shaped sign marks the start of a no-passing zone. It usually appears along with a solid yellow line on the pavement.
- A yellow diamond-shaped sign is a WARNING sign, alerting you to a hazard or change ahead such as a curve, intersection, or school, so you slow down.
- A white rectangular sign with black lettering is a REGULATORY sign stating a law you must obey, such as speed or direction of travel.
- An orange sign marks a construction or roadwork zone. Slow down and watch for workers and shifting lanes.
- A blue sign points to driver services such as gas stations, food, lodging, or hospitals.
- A green sign is a GUIDE sign, showing directions, distances, and the names of exits or places.
- A red circle with a slash means the action shown is PROHIBITED, such as no turn or no U-turn at that spot.
Laws and paperwork
- The traditional driver-education track requires at least 50 supervised hours, including 10 at night.
- The alternative track requires at least 75 supervised hours, including at least 15 at night.
- The minor must maintain a conviction-free record for traffic and substance-related violations during the 6 months immediately preceding the application.
- The GDL restricted license imposes an 11 p.m. to 5 a.m. curfew, with exceptions like adult accompaniment, work, school, religious events, emergencies, and hauling farm/ranch products within 150 miles.
- During the first 6 months, the restricted licensee may carry no more than one passenger under 18 unless supervised by an adult 18+ or the passenger is a family member.
- In the second 6 months, the passenger limit relaxes to no more than three passengers under 18, with the same supervisory/family exceptions.
- Montana prohibits a restricted licensee from carrying a passenger under 18 on a motorcycle during the first six months of the restricted license.
- GDL restrictions last for one year from issuance or until the minor turns 18, whichever occurs first.
Emergencies
- Standard practice, consistent with Montana's emergency vehicle rules, is to yield by pulling to the right and stopping until the emergency vehicle passes.
- Safe driving practice, sometimes called a move-over rule, is to give stopped vehicles extra space by changing lanes or slowing down.
- The manual requires drivers to stop for a school bus with flashing red lights from either direction, unless a physical median or barrier separates the roadways.
- Standard guidance for hydroplaning is to ease off the gas and avoid sudden braking or steering, letting the tires regain contact with the road.
- Move Over laws require drivers to move over or slow down for any stopped vehicle with warning lights activated, to protect people near the roadway.
- Rapid brake lights or hazard signals ahead indicate a potential emergency or obstruction, so drivers should slow down and prepare to react safely.
- Per N.J.S.A. 39:4-81, a malfunctioning or dark traffic signal must be treated as an all-way stop.
- Pumping the brakes can build pressure in some systems, and downshifting uses engine braking to help slow the vehicle safely.
- Drivers must yield to emergency vehicles by pulling over to the right side of the road, clear of intersections, and stopping until the vehicle passes.
- Moving vehicles safely out of the flow of traffic prevents further collisions before drivers exchange license and insurance information.
- Move over laws generally require drivers to change lanes away from a stopped emergency or hazard vehicle when safe, or otherwise slow down.
- Drivers are required to stop at the scene of a crash involving injury or significant damage, provide information, and call for assistance if needed.
- Drivers must yield to emergency vehicles by moving to the right edge of the roadway, staying clear of intersections, until it passes.
- The manual notes you only have right of way if the other vehicle isn't already in the intersection, meaning a vehicle already there should be allowed to clear first.
- The manual notes that if you're already in an intersection when an emergency vehicle approaches, you should proceed through it first before pulling over to stop.
- Drivers must yield right-of-way to emergency vehicles operating with active lights and siren.
- Drivers must yield to emergency vehicles by pulling over and stopping, clearing the intersection first if already inside it.
- Steering gently in the direction you want to go while easing off the accelerator helps regain control during a skid.
- The priority is to stop safely away from traffic, shut off the engine, and move away from the vehicle before dealing with the fire.
- On divided highways of 4+ lanes, drivers should move over a lane away from a stopped emergency vehicle when it can be done safely.
- If your car catches fire or smells like burning, pull over, shut off the engine, and get everyone away. Do not open the hot hood, since the rush of air will make the fire flare up.
- If the gas pedal sticks, shift to Neutral to cut the power, then brake and steer to the shoulder. Only turn off the engine after you have fully stopped, so you do not lose power steering.
Signs
Sign shape and color carry meaning before you even read the words. A red octagon always means stop, a red-bordered triangle pointing down means yield, and yellow diamonds warn of a hazard ahead. For every sign image used in our practice test, with the exact meaning and explanation, see the full road sign glossary.
Keep studying
This cheat sheet is a summary, not a substitute for practice. Test yourself with the free Montana DMV practice test, which explains the reasoning behind every answer, or see Montana DMV facts and fees before test day.