Kentucky Driving Laws 2026: Speed Limits, DUI BAC and Kentucky DMV Road Rules for the Permit Test

What speed limits apply in Kentucky when no sign is posted? Kentucky sets 35 mph in business or residential districts, 55 mph on other state highways, and 65 mph on interstates and parkways unless a 70 mph limit has been established on an authorized segment. The permit test is 40 questions with 80% required. DUI threshold: 0.08% for adults, 0.02% for under-21. Kentucky requires headlights from one-half hour after sunset to one-half hour before sunrise, and at other times when atmospheric conditions reduce visibility to the level ordinarily present during that nighttime period. Text-based communication is prohibited while a vehicle is moving on the traveled roadway, and drivers under 18 are subject to a broader personal-device restriction.

1. Speed Limits in Kentucky

Kentuckys unposted speed limits are set by road classification, and the Transportation Cabinet secretary can raise specific highways to 70 mph. Parkways and interstates share the same 65 mph default. Heres exactly what applies when no sign is posted:

Key test point: Kentuckys 35 mph default for business and residential districts is higher than many other states 25-30 mph defaults. The off-street parking facility limit of 15 mph, including public parking garages and surface lots, is a Kentucky-specific rule that appears on the knowledge test. The Kentucky Driver Manual recommends a maximum speed of 55 mph for most vehicle-trailer combinations; drivers must still obey the posted speed limit.

2. Right-of-Way: Funeral Processions Too

Kentucky has a specific right-of-way rule for funeral processions: a funeral procession led by an escort vehicle has the right-of-way at intersections and may proceed through even if the signal changes. Know all the right-of-way scenarios for the Kentucky knowledge test, they are among the most frequently tested topics.

4-way stop (all arrive at once)

Driver to the right

4-way stop (one arrives first)

Driver who arrived first

Roundabout / traffic circle

Vehicles already inside the circle

Emergency vehicles (lights/siren)

Emergency vehicle, pull to the right and stop

Pedestrians in crosswalk

Pedestrians always

T-intersection (no signs)

Through road traffic; drivers on the dead-end must yield

Yield sign

Cross traffic and pedestrians always

Merging onto a highway

Traffic already on the highway

3. Turns & Signal Laws

Kentucky requires signaling at least 100 feet before a turn, and the handbook specifically lists turnabouts (U-turns), freeway entries and exits, and pulling from the curb as situations requiring a turn signal. Right turns on red are permitted after a full stop unless a sign prohibits it:

Right turn on red

Permitted after a full stop unless a sign prohibits it. Yield to pedestrians and cross traffic.

No right turn on red

When posted, you must wait for a green light before turning right.

Left turn on red

Only allowed from a one-way street onto another one-way street, after a full stop.

Left turn from two-way street

Start from the extreme left-hand lane lawfully available; whenever practicable, leave the intersection in the extreme right-hand lane lawfully available on the roadway being entered.

Right turn

Stay as close to the right curb as possible; end in the right lane.

U-turns

Legal where not prohibited by a sign; must not interfere with traffic. On a curve, or on the approach to or near the crest of a grade, a turnabout is prohibited unless the vehicle can be seen for at least 500 feet by drivers approaching from either direction. The handbook uses the term "turnabout" for this maneuver, and requires a turn signal before executing one.

4. Lane Rules & Line Markings

On Kentuckys parkways and the I-64/I-65/I-75 corridor through the Bluegrass, lane discipline is essential. On mountain roads in Eastern Kentucky where passing zones are rare and blind curves are common, understanding line markings can be life-or-death. Heres the full breakdown tested on the Kentucky exam: Kentucky also restricts the leftmost lane on limited-access highways with four or more lanes and a posted speed of at least 65 mph to passing, yielding to entering traffic, or conditions that make the right or center lanes unsafe. On Kentucky mountain highways, keep the vehicle under control and as near the right-hand edge as reasonably possible; sound the horn before a curve when the view is obstructed within 200 feet.

Center turn lane (CTSL)

Reserved for left-turning vehicles from either direction; not for through traffic or passing other vehicles.

Solid white line

Do not cross; marks the edge of the road or a lane that should not be changed.

Solid yellow line (your side)

No passing allowed.

Broken yellow line

Passing allowed when safe.

Solid + Broken yellow centerline

Passing allowed only on the broken-line side.

5. Passing Another Vehicle

On Kentuckys winding mountain roads through the Appalachian Plateau and the Daniel Boone National Forest, passing opportunities are rare and misjudgments are fatal. On the flat Bluegrass two-lanes, the temptation to pass is higher, but the rules are firm:

• Only pass on the left, using the oncoming lane, when it is safe and legal.
• Do not pass within 100 feet of an intersection, railroad crossing, bridge, or curve where your view is limited. Look for the No Passing Zone pennant sign.
• The vehicle being passed must not speed up while you are overtaking.
• Passing a bicyclist or electric low-speed scooter: Move to the immediate left lane when one is available and safe. On a one-lane roadway, leave at least 3 feet until safely past; if 3 feet is unavailable, use reasonable caution.
• Return to your lane before coming within 200 feet of oncoming traffic.
• Never pass a stopped school bus with flashing red lights, this applies in both directions on undivided roads.
• You may pass on the right when the vehicle ahead is making or about to make a left turn, or when the roadway is wide enough for two or more lawful same-direction lines of traffic. Pass only when safe; driving off the roadway is allowed only when the vehicle being passed is completely stopped and the pass can be made safely.

6. Following Distance

Kentuckys handbook makes the stakes plain: at 55 mph without a seat belt, your body hits the steering wheel at the same speed in a frontal crash. The Kentucky Driver Manual recommends a 4-second minimum following distance under normal conditions, and Kentucky law prohibits following another vehicle more closely than is reasonable and prudent. Increase the gap on slippery roads, around large vehicles or motorcycles, and at night, in fog, or in bad weather.

7. School Buses & Emergency Vehicles

Kentuckys school bus rules generally require stopping for a bus receiving or discharging passengers from either direction. The opposite-direction exception applies only on a highway with four or more lanes divided by an elevated barrier or unpaved median, and stopped traffic must wait until the bus has completed receiving or discharging passengers and has been put into motion. Funeral processions also have specific right-of-way protections tested on the Kentucky exam.

School Buses

• When a school bus stops with flashing red lights and an extended stop arm, all traffic in both directions must stop on undivided roads.
• On a highway with four or more lanes divided by an elevated barrier or unpaved median, opposite-direction traffic is exempt from the stop requirement; traffic approaching from behind the bus must stop.
• A center turn lane is not an elevated barrier or unpaved median. Without the statutory divider, vehicles approaching from the opposite direction must stop.
• You must remain stopped until the bus has completed receiving or discharging passengers and has been put into motion.
• Failing to stop for a Kentucky school or church bus when the statutory stop requirement applies is a traffic violation subject to the penalties in Kentucky law.
• Railroad crossings: Buses and motor vehicles used for transporting children must stop 15 to 50 feet from the nearest track at grade crossings, except where the crossing is protected by gates or a flagman employed by the railroad; the driver must look and listen before proceeding.

Emergency Vehicles

• When you see or hear an emergency vehicle (police, fire, ambulance) with lights or siren: pull to the right edge of the road and stop. Do not block intersections.
• Move Over Law (Kentucky): When approaching a stationary emergency or public-safety vehicle displaying qualifying warning lights, or a disabled vehicle displaying a warning signal such as flashers, flares, or retroreflective signals, move to a nonadjacent lane when the highway has at least four lanes with at least two in your direction and the move is safe. Otherwise reduce speed and maintain a safe speed for conditions. Do not follow an emergency vehicle responding to a call closer than 500 feet.

8. DUI Laws: 0.15% Aggravating Threshold

Kentuckys DUI law is built around a 10-year lookback period, prior convictions within 10 years make each subsequent offense dramatically more serious. There is also an enhanced penalty tier at 0.15% BAC (not 0.20% like many other states), and six specific aggravating circumstances that trigger mandatory minimum jail sentences. Under the law effective July 15, 2026, refusal of a requested breath or blood test results in license suspension; a breath-test refusal may be used as evidence in court, while a blood-test refusal may not be used as evidence of DUI. A breath-test refusal followed by a second or third DUI conviction within 10 years doubles the applicable mandatory minimum jail sentence.

9. Seat Belts: Height-Based Child Rules

Kentucky is a primary enforcement seat belt state, officers can stop you solely for an unbelted occupant. The child restraint law uses a distinctive height-based threshold: 40 inches or under requires a child restraint system; a child under age 8 who is between 40 and 57 inches requires a booster seat; a child greater than 57 inches is not required to use a booster seat under this statute.

10. Where You Cannot Park

Kentuckys handbook focuses on parking safely and in designated areas. The specific 15 mph speed limit in all public parking facilities, publicly or privately owned, is a Kentucky rule that appears on the knowledge test. Heres what you need to know about Kentucky parking rules:

• Within 15 feet of a fire hydrant
• Within an intersection or on a crosswalk
• Within 30 feet upon the approach to a flashing beacon, stop sign, or traffic control signal
• On a controlled-access highway or in a highway tunnel
• On a sidewalk, in front of a sidewalk ramp for persons with disabilities, or in front of a public or private driveway
• At any place where official signs prohibit stopping or parking
• Double parking (alongside a vehicle already parked at the curb)
• Headed downhill: turn wheels toward the curb. Headed uphill with a curb: turn wheels away from curb. Uphill without a curb: turn wheels toward the shoulder.

11. Driving in Bad Weather

Kentucky weather covers the full spectrum, ice storms that shut down I-64 overnight, dense fog in the Cumberland River valley and the Appalachian hollows, flash floods in creek-bottom communities across Eastern Kentucky, and severe thunderstorms from the Ohio River Valley. The Transportation Cabinet handbook addresses every condition:

• Headlights required in Kentucky from one-half hour after sunset to one-half hour before sunrise, and at other times when atmospheric conditions reduce visibility to the level ordinarily present during that nighttime period.
• In heavy fog, use low beams, high beams reflect off fog and reduce visibility.
• If you start to hydroplane, ease off the gas gently. Do not brake hard or turn sharply.
• In icy conditions, brake gently well in advance. Start slowing earlier than normal. Leave extra following distance.
• If your car goes into a skid, steer in the direction you want the front of the car to go. Do not overcorrect.
• Never use cruise control on wet, icy, or slippery roads.

12. Points & License Suspensions

Kentuckys point system is designed to identify dangerous drivers before suspension becomes necessary. Points accumulate within a 2-year window. Drivers age 18 or older who accumulate 12 or more points, and drivers under 18 who accumulate 7 or more points before turning 18, are subject to the Transportation Cabinet hearing and possible suspension or probation process. Heres how it works:

Note: Speeding 26 mph or more over the limit is treated as a serious violation and may result in a 90-day suspension or probation process rather than ordinary point assessment. Kentucky State Traffic School is available online, in-person, and in virtual classroom format. You may only attend once every 12 months. You cannot attend for violations carrying mandatory license suspension. Court referral is required, the District Court where the citation was issued must refer you to the program.

13. Headlight Rules

Kentuckys headlight law requires headlights from one-half hour after sunset to one-half hour before sunrise, and at other times when atmospheric conditions reduce visibility to the level normally present during that nighttime period. The dimming distances are 500 feet for oncoming traffic and 300 feet when following. Both numbers appear on the Kentucky knowledge test:

Key test point: Kentucky uses 500 feet for oncoming traffic and 300 feet when following. The headlight activation window is one-half hour after sunset to one-half hour before sunrise, not exactly at sunset/sunrise. Also: dim when approaching motorcycles, as high beams are especially hazardous to riders on dark Kentucky mountain roads.

14. Night Driving

Kentuckys handbook is direct about night driving on mountain roads: you must be able to stop within the distance your headlights illuminate. On the winding curves of US-23 and US-119 through Eastern Kentucky, and on the dark rural roads of the Pennyrile and western coalfields, overdriving headlights is a leading cause of fatal crashes.

15. Cell Phones & Distracted Driving

Kentuckys handbook uses NHTSAs framework to explain why cell phone use is the most dangerous distraction: texting combines all three types, visual, manual, and cognitive distraction simultaneously. Taking your eyes off the road for 4.6 seconds at 55 mph is the equivalent of driving a full football field without looking.

Key test point: Kentuckys handbook uses the NHTSA three-category framework for distractions, visual, manual, and cognitive. Texting is uniquely dangerous because it involves all three simultaneously. The handbook also notes that using hands-free devices while driving still creates cognitive distraction, the conversation itself takes mental resources away from the driving task.

16. Railroad Crossings

Kentuckys freight rail network, including CSX and Norfolk Southern lines, crosses thousands of public roads statewide. The Kentucky handbook specifies that a train at 55 mph may need a mile or more to stop. The knowledge test covers exact stop distances and which vehicles must always stop regardless of signals.

Key test point: Never drive around or under a lowered crossing gate, it is illegal and extremely dangerous. Wait until gates are fully raised and all tracks are clear.

17. How to Drive a Roundabout

Roundabouts are being installed across Kentuckys highway network, particularly in the Lexington and Louisville metro areas and along US route improvements in central Kentucky. The Transportation Cabinet tests them on the knowledge exam. The rule no one should miss: entering traffic must yield to vehicles already circulating inside, always.

Key test point: The most common wrong answer on roundabout questions is thinking you have right-of-way when entering. You never do, yield to traffic already inside.