Traffic Laws

10 Driving Rules That Change at the State Line (With the Handbook Page for Each)

October 19, 202611 min readFact-checked against official state and federal sources

Reviewed by Chad HenryAfter 25 years of teaching driver education

Most permit-test questions have one answer everywhere: stop on red, yield to pedestrians. A smaller group hides a number each state legislature picked on its own. Those questions catch learners who studied from a friend's advice, a video, or a practice test built for another state.

Below are ten of those rules, the spread of answers across state handbooks, and a link to the handbook page so you can check your own state's number before test day.

Why learners get these questions wrong

The "most states" trap. "No parking within 15 feet of a fire hydrant" is correct in Alabama and wrong in Iowa. Generic practice tests teach the most common number; your DMV asks for yours.
Two numbers inside one rule. Several states use one distance in town and a longer one on fast roads. Learners memorize one and miss the other.
The exception is the question. Divided highways, painted versus raised medians, center turn lanes: test writers like the case where the everyday rule does not apply.

The fix is to study the handbook for the state issuing your permit and practice with questions written from it. Every state page here has a study sheet, such as the Texas cheat sheet or the Florida cheat sheet, and the hardest permit test questions page collects the questions people miss most.

1. Fire hydrant parking distance

The number most people learn is 15 feet. In the handbooks we checked it runs from 5 to 15 feet, and more states say 10 than 15.

State	Rule	Source
Iowa	No parking closer than 5 feet	Manual p.21
Vermont	No parking within 6 feet	Manual p.29
Rhode Island	No parking or stopping within 8 feet	Manual p.32.pdf)
New Jersey	No parking within 10 feet	Manual p.85
Alabama	No parking within 15 feet	Manual p.29

2. How far from a stopped school bus you must stop

Stopping for a school bus with flashing red lights is the easy part. How far back you stop is where the handbooks part: 10 feet in Mississippi and Pennsylvania, 30 feet in Louisiana and Montana.

State	Rule	Source
Mississippi	Stop at least 10 feet away	Manual p.58
Iowa	Stop at least 15 feet behind the bus	Manual p.20
Minnesota	Stop at least 20 feet away until the lights stop	Manual p.42
New Jersey	Stop at least 25 feet away	Manual p.77
Montana	Stop at least 30 feet away	Manual p.40

The divided-highway exception is the other split. Florida excuses oncoming traffic only past a raised barrier or an unpaved median at least 5 feet wide; painted lines do not count. Arkansas needs a median of at least 20 feet. Center turn lanes are the classic trick: Louisiana and Tennessee say a road with a center turn lane is not divided, so both directions stop. North Carolina says that on four or more lanes plus a center turn lane only traffic behind the bus stops, and Utah excuses oncoming traffic on five or more lanes with a center turn lane.

3. Move Over law: how much you must slow down

The handbooks agree on step one: move a lane away from a stopped emergency vehicle when you safely can. The backup rule for when you cannot is what changes.

State	Rule	Source
Indiana	Cannot change lanes: slow to 10 mph under the limit	Manual p.51
Alabama	Four-lane road, cannot change lanes: slow 15 mph or more below the limit	Manual p.68
Texas	Cannot change lanes: slow to 20 mph under the limit	Manual p.46
Colorado	Cannot move over: slow to 25 mph or 20 mph below the limit	C.R.S. 42-4-705
South Dakota	Stopped emergency vehicle with red lights: come to a complete stop first	Manual p.2

A related number is how far behind a responding emergency vehicle you may follow: 200 feet in Georgia, 300 feet in California and New Jersey, 500 feet in Iowa and Virginia.

4. Default speed limits in residential and business districts

When no sign is posted, the statutory limit applies. The common test answer is 25 mph, but handbooks range from 20 to 35 mph, and some states split business and residential streets.

State	Rule	Source
Iowa	Business district: 20 mph; residential: 25 mph	Manual p.42
Oregon	Business district: 20 mph; residential: 25 mph	Manual p.19
Virginia	Business, residential and school areas: 25 mph	Manual PDF p.17
New Jersey	Suburban business and residential: 35 mph (25 mph elsewhere)	Manual p.62
Texas	Urban district: 30 mph	Manual p.46
Kentucky	Business or residential district: 35 mph	Manual p.49

5. How far ahead to signal a turn

The figure most learners carry is 100 feet. Tennessee asks for 50, Delaware for 300, and several states add a longer distance for faster roads. Utah and Idaho give time instead of distance.

State	Rule	Source
Tennessee	At least 50 feet before a turn or lane change	Manual p.56
California	During the last 100 feet before the turn	Manual p.11
North Carolina	100 feet; 200 feet where the limit is 45 mph or more	Manual p.69
Pennsylvania	100 feet under 35 mph; 300 feet at 35 mph or more	Manual p.44
Delaware	At least 300 feet before turning	Manual p.81
Utah	Two seconds before turning or changing lanes	Manual p.34

6. When headlights must be on

Three rules hide here: a clock rule (sunset to sunrise, or 30 minutes after sunset), a visibility rule, and a wiper rule. States mix them differently, and the visibility distance is 400, 500 or 1,000 feet depending on where you are.

State	Rule	Source
North Carolina	Sunset to sunrise, and when visibility is 400 feet or less	Manual p.71
Virginia	When bad weather cuts visibility to 500 feet	Manual p.22
Texas	30 minutes after sunset to 30 minutes before sunrise, or under 1,000 feet of view	Manual p.47
Pennsylvania	When you cannot see 1,000 feet ahead	Manual p.40
Florida	Sunset to sunrise, and in rain, smoke or fog	Fla. Stat. 316.217

Wipers on means headlights on in Alabama, Arkansas, Delaware, Kansas, Maine, Missouri, North Carolina, Pennsylvania, Rhode Island and Virginia, among others. Pennsylvania adds that daytime running lights do not count; headlights and tail lights must be switched on.

7. Bicycle passing distance

Three feet is the answer in most handbooks, including Alabama, California and Florida. The states that left 3 feet went in different directions, and South Dakota ties the gap to the speed limit.

State	Rule	Source
Florida	At least 3 feet	Fla. Stat. 316.083
New Jersey	At least 4 feet on a single-lane road; if impossible, slow to 25 mph	Manual p.150
Pennsylvania	At least 4 feet	Manual p.92
Montana	About 5 feet	Manual p.43
South Dakota	3 feet where the limit is 35 mph or less; 6 feet above 35 mph	Manual p.62
Iowa	Change lanes completely, as you would for a car	Manual p.58

8. Railroad crossing stop distance

Many handbooks teach 15 to 50 feet from the nearest rail. Others give only a minimum, and a few allow 10 feet. Parking near tracks varies too: Mississippi bans it within 15 feet of the rail; Texas and Washington say 50 feet.

State	Rule	Source
Colorado	No stop line: at least 10 feet from the tracks	Manual p.21
Minnesota	Active signals: at least 10 feet from the nearest rail or gate	Manual p.53
Mississippi	Between 10 and 50 feet from the outer rail	Manual p.36
Texas	15 to 50 feet from the nearest rail	Manual p.21
California	At least 15 feet from the nearest track	Manual p.51

9. U-turn visibility

A U-turn is legal only where approaching drivers can see you from a set distance: 200 feet in California, 500 feet in most states that give one, 1,000 feet in Minnesota on curves and near hilltops. Virginia adds that a U-turn counts as two left turns, so a No Left Turn sign bans it.

State	Rule	Source
California	Not where you cannot see clearly 200 feet each way	Manual p.20
Oregon	In a city, only where traffic can see you from 500 feet each way	Manual p.41
Pennsylvania	Drivers from all directions must be at least 500 feet away	Manual p.46
Minnesota	On curves or near hilltops, only if visible from 1,000 feet	Manual p.33

10. When a crash must be reported

The handbooks agree less here than anywhere else above. The property-damage threshold runs from $500 to $4,000, and the deadline and agency differ too. Florida's threshold comes from the statute, not the handbook.

State	Rule	Source
Delaware	$500 or more property damage on a public highway: report to police	Manual p.141
California	Over $1,000 damage or injury: DMV form SR 1 within 10 days	Manual p.78
Wisconsin	$1,000 or more; $200 or more if government property is damaged	Manual p.47
Iowa	Injury or over $1,500 damage: report within 72 hours	Manual p.63
Florida	Injury, death or $2,000 or more: report to police at once	Fla. Stat. 316.065
North Dakota	Injury, death or $4,000 or more combined damage	Manual p.27

Deadlines are their own test question: Washington gives 4 days if police do not file, West Virginia 5 days, Montana 10 days and Arkansas 30 days.

How to use this before your test

Write down your state's number for each of the ten rules. Ten numbers fit on an index card.
Read the handbook page linked in each table; the test will use the handbook's wording. State pages such as Iowa and New Jersey link the practice test and study sheet for that state.
If your state is missing from a table, its handbook did not give a figure we could verify. That does not mean it has no rule.