Tennessee TDOS Study Guide 2026 — Key Numbers, Signs, DUI, Right of Way

📖 Tennessee TDOS Study Guide

Everything important from the Tennessee Driver's Manual handbook — organized for the exam

⭐

Memorize these numbers first. Tennessee test questions are frequently built around specific distances, speeds, BAC levels, and time periods. These come up constantly.

Speed Limits

HIGH FREQUENCY

55 mph

Default speed limit (state/federal highways when not posted)

55 mph

Critical Distances & Clearances

HIGH FREQUENCY

50 ft

Signal before a turn at an intersection

500 ft

Dim high beams for oncoming traffic

500 ft

Dim high beams when following another car (same as oncoming — TN law)

3 ft

Clearance when passing a bicyclist

$400

Damage threshold requiring crash report to TDOS (within 20 days)

🍺

DUI & Alcohol Numbers

ALWAYS ON TEST

.08%

Legal BAC limit for drivers 21+

.02%

BAC limit for drivers under 21 (underage DUI at 0.02%+)

.20%

BAC threshold — minimum jail increases from 48 hrs to 7 days

$350–$1,500

1st DUI fine (plus court costs)

48 hrs

1st DUI minimum jail (7 days if BAC ≥ 0.20%)

1-year

1st DUI license revocation (2 years for 2nd offense)

10 years

DUI lookback period for repeat offenses

🎓

Teen / GDL Numbers

ON EXAM

180 days

Minimum permit hold before Intermediate Restricted license

50 hrs

Required supervised practice driving (10 hrs at night)

10 hrs

Of the 50 hours — must be at night

Max other passenger allowed (Intermediate Restricted phase only)

10 PM

Curfew — learner permit: 10 PM–6 AM | Intermediate Restricted: 11 PM–6 AM

90 days

Added to IR hold period per violation (manual p.17)

21+

Minimum age of supervising driver (front passenger seat)

4 steps

Permit → IR → Unrestricted → Regular Class D (under 18)

⏱️

Following Distance & Time Rules

ON EXAM

2 sec

Two-Second Rule — normal conditions (manual p.48)

4 sec

Minimum following distance in rain, night, interstate, or motorcycle

300 ft

Stopping distance at 55–60 mph (reaction + braking)

5 sec

How long a text takes your eyes off the road

🚦

Road signs are tested heavily. Know each sign's shape, color, and meaning. The real test often shows a sign description and asks what it means.

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Sign Shapes — Each Shape Has One Meaning

ALWAYS TESTED

Shape	Meaning	Example
Octagon (8-sided)	STOP — always and only	Stop sign
Triangle (pointing down)	YIELD — give right of way	Yield sign
Diamond	WARNING — hazard ahead	Curve, pedestrian, deer
Pentagon (5-sided)	SCHOOL ZONE	School crossing
Pennant (triangle right)	NO PASSING ZONE	No-passing pennant
Round (circle)	RAILROAD CROSSING advance warning	RR crossing sign
Rectangle (vertical)	REGULATORY — rules you must follow	Speed limit, turn restrictions
Rectangle (horizontal)	GUIDE or INFORMATION	Street name, mile marker
X-shaped crossbuck	RAILROAD CROSSING — treat like yield	Railroad crossbuck

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Sign Colors — Color Tells You the Category

ALWAYS TESTED

Color	Category	What It Means
Red	Regulatory — STOP / PROHIBIT	Stop, yield, do not enter, wrong way, no-turn circles
Yellow	WARNING	General hazard warnings — curves, hills, intersections, animals
Orange	WORK ZONE / CONSTRUCTION	Construction ahead, road crew, $250–$500 mandatory speeding fine
Green	GUIDE / DIRECTIONAL	Highway exits, distances, direction, mile markers
Blue	SERVICES	Gas, food, lodging, hospital, rest area
Brown	RECREATION / CULTURAL	Parks, campgrounds, historical sites, scenic areas
White	REGULATORY	Speed limits, lane rules, turn restrictions
Fluorescent Yellow-Green	WARNING — pedestrian / school / bike	School zones, crosswalks, bike lanes

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Signs That Are Frequently Confused

TRICKY

No Passing Pennant vs. No U-Turn: The pennant (pointing right) = no passing. A circle with a slash over a U-turn arrow = no U-turn. Very different.

Crossbuck (RR) vs. Stop Sign: The crossbuck (white X) = yield/slow down and check. Only stop if a train is coming. The octagon = always stop.

Divided Highway Begins vs. Ends: Begins = two arrows pointing apart (median starts). Ends = two arrows merging together (median ends — expect two-way traffic).

Merge vs. Lane Ends: Merge = two roads joining (both cars adjust). Lane Ends = one lane disappears — that driver must yield and merge.

Red Circle with Slash: Always means that action is PROHIBITED. No left turn, no trucks, no bicycles — whatever is inside the circle is forbidden.

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Right of way is the #1 failure topic on the Tennessee TDOS test. Master every scenario below — these questions will be on your exam.

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The Core Right-of-Way Rules

MOST TESTED

Uncontrolled intersection — arrive at same time: Yield to the driver on your RIGHT. This is the most tested right-of-way rule.

Left turn at green light: You must always yield to oncoming traffic AND pedestrians — even with a green light. A green light is permission to go, not a guarantee of right of way.

Pedestrians in a crosswalk: Always yield. Stop and wait until the pedestrian has completely crossed — not just stepped back. This includes jaywalkers in many situations.

Blind pedestrian (white cane / guide dog): Absolute right of way — you must stop regardless of where they are crossing.

Four-way stop: First to arrive goes first. Simultaneous arrival = yield to the driver on your right. Straight traffic before turning traffic if both arrive at same time from opposite directions.

Emergency vehicles (lights + siren): Pull to the right edge of the road and stop. Clear intersections first — never stop IN an intersection.

Entering from driveway / private road: Always yield to all traffic on the public road — you have no right of way entering from private property.

Roundabout: Vehicles inside the roundabout always have right of way. Entering traffic must yield. When exiting, yield to pedestrians at the crosswalk.

Merging onto a highway: Traffic already on the highway has right of way. The merging vehicle must yield and find a safe gap.

Non-functioning traffic signal: Treat as an all-way stop. All drivers stop, yield, and take turns.

💡

Right-of-Way Scenarios That Trick People

TRICKY

Yellow light: It does NOT mean speed up. If you can stop safely, you must. Proceed only if stopping would be unsafe (you're too close to stop).

Already in intersection when light turns red: Complete the turn — you are committed. Other traffic must wait for you to clear.

Backing out of a driveway: The reversing vehicle always yields to street traffic. You have no right of way in reverse.

Bus re-entering traffic: Tennessee requires you to yield to a bus with its left-turn signal on pulling away from a stop — when safe to do so.

Right turn on red: Legal ONLY after a complete stop and yielding to ALL traffic and pedestrians. Rolling right on red is illegal.

Left on red: Legal ONLY when turning from a one-way street onto another one-way street — after a complete stop and yielding.

🚥

Traffic Signal Meanings

ALWAYS TESTED

Signal	What You Must Do
Solid GREEN	Proceed — but yield to traffic already in intersection
Solid YELLOW	Prepare to stop if safe; proceed only if stopping would be dangerous
Solid RED	Stop completely; may turn right on red after stop and yield (unless posted)
GREEN ARROW	Protected turn — cross traffic is stopped. You may turn without yielding.
YELLOW ARROW	Protected turn is ending — prepare to yield or stop
Flashing YELLOW ARROW	Unprotected turn — you MAY turn but MUST yield to oncoming and pedestrians
Flashing RED	Treat exactly like a STOP sign — stop, yield, proceed when safe
Flashing YELLOW	Caution — slow down and proceed carefully. Do not need to stop.
RED + GREEN ARROW	Stop for through traffic; turn in direction of arrow only
Signal NOT working	Treat as ALL-WAY STOP — all traffic stops

🛣️

Lane Markings — Know Each One

ON EXAM

Broken yellow center line: Passing is permitted from your side when it is safe.

Solid yellow line on your side: No passing from your side of the road.

Double solid yellow: No passing in either direction.

White lines: Separate traffic going in the same direction. Broken = lane change ok. Solid = discouraged (but not always illegal).

Yellow lines: Separate traffic going in opposite directions.

Center left-turn lane (two-way turn lane): Use ONLY to prepare for and make a left turn. Never use as a travel or passing lane.

Yellow X over a lane: Lane is CLOSED — move to a lane with a green arrow immediately.

White stop line: Stop your front bumper at or behind this line at intersections and crosswalks.

↔️

Safe Lane Changing Procedure

STEP BY STEP

Check your mirrors — rearview and side mirror on the side you're moving to

Signal your intent — at least 50 feet before the turn or lane change

Look over your shoulder — physically check the blind spot. Mirrors cannot see everything.

Change lanes gradually — smooth and controlled, not jerky

Cancel signal and adjust speed to match the lane's traffic flow

🚨

DUI questions appear on virtually every Tennessee TDOS test. Know the BAC levels, implied consent law, and penalties. Tennessee uses "DUI" (Driving Under the Influence) — not "OWI," "DWI," or "OVI."

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DUI Laws — The Numbers You Must Know

ALWAYS ON TEST

Situation	Consequence
BAC of .08%+ (driver 21+)	DUI — criminal charge (TCA.010)
BAC of .20%+	Aggravated 1st offense — minimum jail increases from 48 hours to 7 days
BAC of .02%+ (under 21)	Underage DUI (underage driving while impaired) — 1-year license loss + $250 fine
Refusing chemical test	12-month court-imposed license suspension (implied consent law)
First DUI	$350–$1,500 fine; 48 hrs jail minimum (7 days if BAC ≥ 0.20%); 1-year license revocation
No Refusal Law (2012)	Officers can obtain search warrant for blood sample if you refuse chemical test
DUI + passenger under 18	Drunk Driving Child Protection Act — mandatory +30 days jail + $1,000 fine (added to DUI penalties)
DUI causing death	Vehicular homicide — separate felony charge with fine and prison
DUI causing injury	Aggravated assault — separate felony charge with fine and prison
DUI lookback period	10 years — penalties increase for repeat offenses

💡

Critical DUI Facts to Remember

TESTED

Implied Consent: By driving in Tennessee, you implicitly consent to chemical testing. Refusing results in a 12-month court-imposed suspension of driving privileges.

Only TIME removes alcohol: Coffee, food, cold showers, and fresh air do NOT lower your BAC. Your liver processes about 1 drink per hour — nothing speeds this up.

Impairment starts with the first drink: You can be convicted of DUI even below .08% if your driving is impaired. Judgment and reaction time suffer immediately.

0.02% for under 21: Tennessee has near-zero tolerance for underage drinking and driving. Even one drink can put you over 0.02%.

Open container law: Open alcohol in the passenger compartment is illegal. It must be in the trunk or an area not accessible to the driver or passengers.

Distracted driving: Tennessee's hands-free law (Public Chapter 412, 2019) makes it illegal for any driver to hold a phone with any part of their body while driving. Texting while driving is also a separate violation. Do not use a handheld phone while driving.

Cannabis: Both recreational and medical marijuana remain illegal in Tennessee. Driving impaired by any substance — including cannabis, prescription drugs, or over-the-counter medications — carries the same DUI penalties as alcohol.

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School bus rules are heavily tested — especially the divided highway exception. Many people fail this question. Learn the exact rule.

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School Bus Stopping Rules

HEAVILY TESTED

General rule: When a school or church bus is stopped on any roadway to load or unload passengers, you must stop. Remain stopped until all people are clear of the roadway and the bus is in motion.

Divided highway with median/barrier: A stop is NOT required when the highway has separate roadways divided by a median space or barrier not suitable for vehicular traffic. A turn lane does NOT count as a barrier.

All undivided roads: ALL traffic in BOTH directions must stop — whether following or approaching from the opposite direction.

Church buses too: Tennessee's law applies to both school AND church buses — unique to Tennessee. Stop for both types.

When may you proceed: Only when all people are clear of the roadway and the bus is in motion. Do not attempt to pass while stop arm and signal lights are activated.

Yellow lights = warning: Yellow flashing = bus is about to stop. Slow down immediately and prepare to stop. Do not try to pass before it stops.

School buses must stop at ALL railroad crossings — regardless of whether warning signals are active. This is federal law.

Speed Laws — What You Must Know

ON EVERY TEST

Basic Speed Law: Drive at a speed that is reasonable and proper for existing conditions — even if that means going below the posted limit. Rain, fog, heavy traffic, school zones all require reduced speed.

Posted limits are MAXIMUMS: You may never legally exceed a posted limit, regardless of conditions, traffic, or what other drivers are doing.

Minimum speed law: Do not drive so slowly that you impede or block the normal flow of traffic. Driving too slowly is also illegal.

Work zone speeding fine: Tennessee law mandates a minimum fine of $250 and up to $500 for violations of the speed limit posted in active work zones.

"Over-driving your headlights": At night, never drive faster than you can stop within the distance your headlights illuminate. Driving faster than this is reckless.

↔️

Following Distance — The Two-Second Rule

TESTED

Pick a fixed object — a sign, overpass, or lane marking ahead

When the car ahead passes it, start counting: "one thousand one, one thousand two"

If you pass the object before 2 seconds — you are too close. Back off.

💡 When to increase beyond 2 seconds (use at least 4 seconds)

Rain, snow, ice, or fog → increase even more
Driving at night or on unfamiliar roads → add 1–2 seconds
Following a large truck or motorcycle → extra space
Towing a trailer → extra space
Following vehicles that must stop at railroad crossings

📐

Passing Rules

TESTED

✓

You MAY pass when: There is a broken yellow line on your side, you have sufficient sight distance, and there is no sign or condition prohibiting passing.

✗

NEVER pass: On hills or curves where you cannot see oncoming traffic; within 100 feet of a railroad crossing, bridge, or intersection; in no-passing zones (solid yellow on your side); near school buses; when it would require going off the road.

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When it is safe to return: You may move back into your original lane when both headlights of the passed vehicle are visible in your rearview mirror.

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Passing on the right: Legal when the vehicle ahead is making a left turn and there is a safe lane to the right, or on a multi-lane road.

🅿️

Parking Clearance Requirements

TESTED

Rule	Requirement
General parking rule	Always park in a designated area, as far from traffic as possible
Curb parking	Park as close to the curb as possible when along a roadway
Handicapped space (without placard)	Unlawful — punishable by a fine. Must display official permit AND transport a disabled person
Leaving your vehicle	Turn off engine, remove key, lock doors — required by law
Inside an intersection or on a crosswalk	Never — always illegal
No-Parking zones	Check for signs or painted curbs that prohibit or limit parking
Exiting vehicle	Safest to exit on curb side. If using street side, check traffic first

⛰️

Parking on Hills — Wheel Position

TRICK QUESTION

💡

The rule: always turn wheels so that if the car rolls, it rolls away from traffic or is caught by the curb.

Situation	Turn Wheels	Why
Facing DOWNHILL, WITH curb	RIGHT (into curb)	Car rolls into curb and stops
Facing DOWNHILL, NO curb	RIGHT (away from road)	Car rolls away from traffic
Facing UPHILL, WITH curb	LEFT (away from curb)	Car rolls back, caught by curb
Facing UPHILL, NO curb	RIGHT (away from road)	Car rolls away from traffic

💡 Memory trick

Going downhill with a curb = wheels RIGHT into the curb
Going uphill with a curb = wheels LEFT, away from curb (tire catches it when rolling back)
No curb either way = wheels RIGHT, away from road

🎓

GDL questions appear on many tests, especially for younger test-takers. Know the three phases, the restrictions in each, and the specific numbers.

🎓

Tennessee Graduated Driver Licensing (GDL) — 4 Steps

ON EXAM

Step 1 — Learner Permit (age 15+)

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Minimum age: 15 to apply for a learner permit. Parent/legal guardian must sign application for under 18.

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Must hold permit for at least 180 days before Intermediate Restricted license

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Must be accompanied by a licensed driver age 21 or older in the front passenger seat at all times

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Under 18: Complete 50 hours of supervised driving, including 10 hours at night (on form SF-1256)

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Curfew (under 18): 10 PM–6 AM unless good cause (emergency, school, work)

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Violations (6+ points): must maintain a record with less than 6 points for 180 consecutive days before advancing

Step 2 — Intermediate Restricted License (age 16+)

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Must be 16, held permit 180 days, passed TDOS road skills test

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Must hold IR for 1 year minimum before applying for Intermediate Unrestricted

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Curfew: 11 PM–6 AM (different from permit phase). Passenger restriction: 1 other passenger

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Violations (6+ pts, at-fault crash, or 2nd seatbelt violation): adds 90 days to the 1-year IR hold period

Step 3 — Intermediate Unrestricted License (age 17+)

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Must be 17, held IR for 1 year, no 6+ points/at-fault crash/2nd seatbelt violation. No additional tests required.

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No curfew, no passenger restrictions. License still says "Intermediate" on it.

Step 4 — Regular Class D License

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Age 18, or graduation from high school / GED, whichever comes first. "Intermediate" removed from license.

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GDL does NOT apply to anyone 18 or older, or those under 18 who have graduated HS or received GED

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0.02% BAC limit still applies until age 21; 0.08% limit for 21+

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License valid for 8 years (persons 21+). Under 21: license displays "Under 21" notation.

🛡️

Emergency Situations — What to Do

TESTED

💨

Tire blowout: Hold the wheel FIRMLY. Ease off gas (don't brake suddenly). Let the car slow naturally. Then gently steer to safety. Sudden braking causes a spin.

💧

Hydroplaning: Ease off gas, hold wheel steady, avoid braking. Let tires re-contact the road. Don't jerk the wheel or brake hard.

🔥

Engine fire: Pull over immediately, turn off engine, get EVERYONE out and move far away (100+ feet). Call 911. Never open the hood.

⚡

Brakes fail: Pump brakes rapidly to build pressure. Downshift to use engine braking. Use parking brake carefully (gradually). Steer to safety.

🌊

Accelerator sticks: Shift to NEUTRAL immediately. Apply brakes. Pull over. Turn engine off.

🌀

Vehicle skids: Ease off gas and brakes. Steer in the direction you want the front to go (into the skid). Do not overcorrect.

🚂

Stalled on railroad tracks: Get EVERYONE out IMMEDIATELY. Move away at a 45° angle in the direction the train is coming — so debris flies away from you. Call 911 and the railroad ENS number.

🌫️

Driving in fog: Use LOW beams (high beams reflect off fog and blind you). Slow significantly. Use fog lights if available. Consider pulling over.

😴

Drowsy driving: Only cure = sleep. Pull over and rest. Coffee, window down, and music are NOT effective solutions. Drowsy driving equals drunk driving in impairment level.

❄️

Stranded in a blizzard: Stay in the vehicle (it's shelter and visible). Run engine briefly for heat with window cracked to prevent CO poisoning. Signal for help with hazards.

🧠

Defensive Driving Principles

ESSENTIAL

Scan ahead: Look 10–15 seconds ahead (about 1 city block) in town, and 15–20 seconds ahead on the interstate, to anticipate hazards early.

Keep an escape route: Always know where you could go if the car ahead stopped suddenly.

Bridges freeze first: Cold air circulates above AND below a bridge. Bridges ice before road surface — always treat them as potentially icy in winter.

Head-on collision approaching: Brake hard and steer RIGHT — even off the road. A head-on crash at speed is almost always fatal; going off-road is survivable.

Road rage: Never engage, retaliate, or make eye contact. Don't respond with gestures. Slow down, create distance. Report to 911 if dangerous.

Front wheel off pavement: Don't jerk the wheel — it can roll the car. Ease off gas, brake gently, and gradually steer back. Hold on tight.

🔧

Vehicle Equipment Requirements

TESTED

Equipment	Requirement
Headlights (on)	½ hour after sunset to ½ hour before sunrise
High beams (dim)	Within 500 ft of oncoming vehicle; within 500 ft when following another vehicle
Tail lights	Two red tail lights required; visible to other drivers (TCA requirement)
Tinted windows	No tinting on windshield. Passenger cars: all windows must transmit at least 35% light. MPVs: rear windows behind driver exempt
TVs / video screens visible to driver	Prohibited while vehicle is in motion (navigation is excepted)
Muffler	Must prevent excessive or unusual noise
Brakes	Two separate braking methods required: regular foot brake AND parking/emergency brake
Wipers	Must adequately clean the windshield when used
Tail lights / rear reflector	Two red tail lights + rear license plate light required
Tires	Must have adequate tread depth and be in safe condition
Hazard lights	For use when parked/stopped in an emergency — not while driving normally
Seat belts	ALL front-seat occupants required; back seat required if passenger under 17, or if driver holds learner/intermediate license — primary enforcement

💡

Headlight Rules That Are Tested

TESTED

Visibility under 200 feet = headlights: Tennessee law requires headlights any time visibility is less than 200 feet — due to weather, fog, smoke, or other conditions — even in daytime. Also required when windshield wipers are in continuous use.

Parking lights ≠ headlights: Parking lights are for indicating a parked vehicle only. They are NOT bright enough for driving. Always use headlights when moving.

Fog lights vs. high beams: In fog, use LOW beams or fog lights. High beams reflect off water particles in fog and reduce YOUR visibility.

Night driving — "drive in your headlights": Never drive faster than you can stop within the distance lit by your headlights. This is called over-driving your headlights and is dangerous.

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Before the Test — What to Do

PREPARATION

Take the TDOS Exam Simulator at least 5 times and score 90%+ consistently. Don't go in when you're scoring 80% — aim higher than the minimum.

Use the "Weak Spots" mode the night before. Every question you got wrong — review those explanations until you understand WHY, not just what the answer is.

Memorize the Key Numbers tab — BAC limits, distances, suspension periods, speed limits. These are direct exam fodder.

Get a good night's sleep. Drowsy test-taking impairs recall just like drowsy driving impairs reaction time.

Bring required documents: Birth certificate, Social Security card, proof of Tennessee residency, and School Compliance Form if under 18. Schedule your appointment with TDOS first.

🧠

During the Test — How to Answer

STRATEGY

The safest answer is usually correct. When in doubt, pick the option that is most cautious, most yields, or stops the most. Tennessee tests reward safe, defensive driving choices.

Watch for "NEVER" and "ALWAYS" options. These are sometimes traps — but in Tennessee driving law, there actually are many absolute rules (ALWAYS stop for school bus, NEVER pass on a hill crest, etc.).

"All of the above" is very often the correct answer on Tennessee TDOS tests — especially for questions about DUI charges, suspension triggers, and violations.

Read every word. Test questions often hinge on words like "4 or more lanes" vs. "fewer than 4 lanes," "school AND church buses," or "first offense" vs. "second offense."

Refusing makes it worse. For DUI questions: refusing a chemical test in Tennessee results in a 12-month court-imposed license suspension. The No Refusal law (2012) also allows officers to seek a warrant for a blood sample.

The real test has 30 questions — you need 80% overall (24/30) to pass. There are no separate sections in Tennessee. Don't panic over 1–2 hard questions.

📋

Recommended Study Order

YOUR PLAN

Read Key Numbers tab — memorize every distance, speed, and BAC number

Read Right of Way + DUI tabs — the #1 and #2 failure topics

Read Road Signs + Signals tabs — shapes, colors, and signal meanings

Read School Buses + Parking tabs — specific rules with specific numbers

Take the Full Practice Bank — all 530+ questions to identify weak spots

Use Weak Spots mode — drill every question you got wrong until you nail it

Run the TDOS Exam Simulator 3–5 times — pass consistently with 90%+ before going in

Night before: Re-read the Key Numbers tab + Test-Day Tips tab. Good sleep. You've got this. ✅