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The basic speed law means you must never drive faster than is safe for the conditions, even when you are under the posted limit. Every US state sets its own speed limits, so numbers differ, but the idea is the same everywhere. This explainer covers the basic speed rule, default limits where no sign is posted, school and work zones, and driving too slowly, using the California, New York and Oregon handbooks as worked examples.
Key facts
- The posted limit is a maximum for good conditions, not a target.
- You can be ticketed for going too fast for conditions even below the limit (New York and Oregon handbooks say so directly).
- Default limits apply where no sign is posted, and they vary by state. New York: 55 mph. California and Oregon: 25 mph in residential districts.
- Work zone fines double in New York, and in California when workers are present.
- On the California drive test, driving 10 mph over or under the limit without reason is a critical error (automatic fail).
What is the basic speed law?
Oregon’s manual states it as the “basic rule”: you must drive at a speed that is reasonable and cautious for existing conditions. Two consequences follow:
- It does not let you go over the limit. Oregon says the basic rule does not allow you to drive over the speed limit, even if conditions seem perfect.
- It can make the safe speed lower than the sign. Rain, fog, ice, heavy traffic, pedestrians or a sharp curve can all make the posted speed too fast. New York warns you can be ticketed for a speed that is not reasonable for conditions, even below the limit.
The wording differs by state. Your state handbook’s speed section is what the permit test uses.
Speed limits when no sign is posted: three states compared
| Where | California | New York | Oregon |
|---|---|---|---|
| Alleys | 15 mph | Not covered | 15 mph |
| Blind intersection | 15 mph | Not covered | Not covered |
| Business district | 25 mph | New York City: 25 mph unless posted | 20 mph |
| Residential district | 25 mph | New York City: 25 mph unless posted | 25 mph |
| School zone | 25 mph within 500 feet of a school while children are outside or crossing (some zones as low as 15 mph) | Follow posted signs | 20 mph within a school speed zone |
| Other roads with no posted limit | 65 mph maximum on most highways; 55 mph on two-lane undivided highways and when towing | 55 mph | 55 mph |
| Interstates | As posted | As posted | Limits vary (the manual gives no figure) |
These defaults apply unless a sign says otherwise. Cities can set different limits by ordinance. Check your own state’s handbook for its numbers.
Default limits in some other states
- Texas: 30 mph in an urban district, 15 mph in an alley, 70 mph on numbered highways outside urban districts and 60 mph on other rural roads (Transportation Code 545.352).
- Indiana: 70 mph on rural interstates (65 for heavy trucks), 60 on rural divided state highways, 55 on urban interstates, undivided state highways and county roads, 30 in urban residential areas and 15 in alleys. Work zones are at least 10 mph below.
- Missouri: 75 mph on rural interstates and freeways, 65 on rural expressways, 60 on urban interstates and other non-urban roads, 55 on lettered roads and 25 in cities, with a 40 mph interstate minimum.
- North Carolina: for offenses from December 1, 2026, 25 mph on unpaved roads and roads without a marked center line (S.L. 2026-46).
California’s railroad crossing rule
California sets 15 mph within 100 feet of a railroad crossing when you cannot see the tracks for 400 feet in both directions. Faster driving is allowed where gates, a warning signal or a flagger controls the crossing. More in railroad crossings.
Work zones and school zones
- Work zones: New York says ticket fines double when you speed in work zones. California doubles fines in highway construction or maintenance zones when workers are present, and says work zone fines can reach $1,000 or more.
- School zones: lower limits usually apply only at set times or when children are present. Read the sign. Watch for school buses too: see school bus stopping laws.
Work zone penalties differ by state. Check the exact rule in your state’s handbook.
Can you get a ticket for driving too slowly?
Yes, if you block normal traffic. California says you may be cited if you drive faster or slower than the speed limit, while still slowing for heavy traffic or bad weather. Oregon says that when you drive slower than the normal flow, you must use the right lane or keep as close as possible to the right edge, unless you are about to turn left, and pull off at a safe spot to let a line of traffic pass.
Speed on your road test
Examiners watch speed closely. California’s drive test criteria list as critical errors:
- driving 10 mph over the limit, or 10 mph under when conditions do not call for it
- driving too fast or too slow for safety
More reasons in common reasons people fail the US driving test.
Common questions
Is it legal to go 5 mph over the speed limit?
No. Any speed over the limit is a violation. Oregon’s manual is clear that the basic rule never allows you to exceed the limit.
What is the speed limit if there is no sign?
It depends on the state and the type of road. New York sets 55 mph where no limit is posted, and 25 mph in New York City. California and Oregon use 25 mph in residential districts.
Can I get a speeding ticket below the speed limit?
Yes, under the basic speed law, if your speed was unsafe for the conditions.
What is a safe speed in rain or snow?
California suggests 5 to 10 mph slower on wet roads, half speed on packed snow and no more than 5 mph on ice. See driving in snow, fog and rain.
Do speeding tickets add points?
In states that use points, a speeding conviction usually adds them. See points systems and license suspensions, and for Georgia’s extra fee, the Georgia Super Speeder law.
How fast can I go on the freeway?
As posted. Freeway limits vary by state and stretch of road. See freeway driving for new drivers.
All US topics: learning to drive in the USA.
Sources
- California DMV, “California Driver’s Handbook: Laws and Rules of the Road (Continued)” (dmv.ca.gov)
- California DMV, “California Driver’s Handbook: Safe Driving” (dmv.ca.gov)
- California DMV, “Driving Performance Evaluation (DPE) Scoring Criteria” (dmv.ca.gov)
- New York State DMV, “New York State Driver’s Manual” (dmv.ny.gov)
- Oregon DMV, “Oregon Driver Manual 2026-2027: Lane Travel, Speed Regulations” (oregon.gov)
- Texas Legislature, “Transportation Code section 545.352” (statutes.capitol.texas.gov)
- Indiana BMV, “Indiana Driver’s Manual” (in.gov)
- Missouri DOR, “Missouri Driver Guide” (dor.mo.gov)
- North Carolina General Assembly, Session Law 2026-46 (ncleg.gov)