California Vehicle Code 22350, known as the basic speed law, requires you to drive at a speed that is reasonable and prudent for current conditions rather than simply staying under the posted number. You can be cited under this statute even when driving below the sign, and after mandatory assessments a typical ticket runs about $234. A conviction adds one point to your DMV record for 36 months and usually raises your insurance premium.
What the Basic Speed Law Requires
The statute is a single sentence. No one may drive on a highway faster than is “reasonable or prudent” given the weather, visibility, traffic volume, and the road’s surface and width. It adds that you may never drive at a speed that endangers people or property.1Justia. California Vehicle Code 22350 (2025)
That endangerment clause is the part drivers underestimate. Even if your speed matched the flow of traffic and stayed below the posted limit, an officer can cite you if your driving created a genuine safety risk. The law is built around outcomes, not speedometer readings.
When Officers Write a 22350 Ticket
The common trigger is a speed that is unsafe for what’s happening around you, regardless of the posted number. Fog, dust, sun glare, and heavy rain can turn a legal speed on a clear day into a citation-worthy speed in that moment.2California Legislative Information. California Vehicle Code 22350 (2025)
Road conditions carry the same weight as weather. Slick pavement, sharp curves, uneven surfaces, and narrow lanes all demand a lower speed, and so does heavy traffic or the presence of pedestrians and cyclists. If you hydroplane into another car at the posted 45 mph limit during a downpour, you were almost certainly violating CVC 22350 even though your speedometer was under the sign.
Enhanced penalties apply if the violation happens in an active highway construction or maintenance zone with workers present and radar in use, under Vehicle Code 42009.3Marin County Superior Court. Appendix of Enhanced Penalty Amounts per Vehicle Code Section
Prima Facie Limits vs. Absolute Limits
California uses two kinds of speed limits, and knowing which one applies determines whether you have any real defense.
A prima facie limit is a speed presumed safe under normal conditions. If you exceed it, the law presumes you were driving unsafely, but you are allowed to try to prove otherwise. California sets a 25 mph prima facie limit on non-state highways in business and residential districts and in school zones while children are arriving or leaving.4Justia. California Vehicle Code 22348-22366 – Article 1. Generally You may present evidence that your speed was still safe given the specific conditions at that time and place, but you carry the burden and judges rarely accept the argument.
An absolute limit offers no such defense. The default maximum on California highways is 65 mph under CVC 22349.5California Legislative Information. California Vehicle Code 22349 Exceed the posted absolute limit by even 1 mph and you are guilty regardless of how safe the conditions were.
What a 22350 Ticket Actually Costs
The base fine looks small. California’s Uniform Bail and Penalty Schedule sets it at $35 for 1 to 15 mph over the safe speed, $70 for 16 to 25 mph over, and $100 for 26 or more mph over.6California Courts. Uniform Bail and Penalty Schedules 2025 Those numbers are misleading, because mandatory state and county penalty assessments, court fees, and surcharges multiply what you actually owe.
After assessments, approximate total costs are:
- 1–15 mph over the safe speed: roughly $234
- 16–25 mph over: roughly $363
- 26 or more mph over: roughly $486
These figures come from the 2025 penalty schedule and may adjust in later years.6California Courts. Uniform Bail and Penalty Schedules 2025 A $35 base fine turning into a $234 bill is not a typo. It’s the standard fee stack.
The Point on Your Record and Your Insurance
A CVC 22350 conviction adds one point to your DMV driving record.7California Legislative Information. California Vehicle Code 12810 The point stays active for 36 months, and it drives two costs that usually exceed the fine.
Insurance is the first. Carriers pull your record at renewal, and a single speeding point commonly raises premiums by 10 to 30 percent for three to five years depending on the insurer. For a driver paying $2,000 a year, even a 15 percent surcharge adds $300 annually, so the true lifetime cost of one ticket often clears $1,000.
The second is the DMV’s negligent operator system. You face a license suspension or probation if you reach four points within 12 months, six within 24 months, or eight within 36 months.8California DMV. Negligent Operator Actions One 22350 by itself won’t put you there. Combined with other violations, it moves the needle fast.
Traffic School to Keep the Point Off Your Record
Most drivers cited under CVC 22350 can attend a state-approved traffic violator school and have the conviction kept confidential. When the record is masked, the DMV does not count the point under its negligent operator system, and insurance companies do not see the violation on a standard record check.9California Legislative Information. California Vehicle Code 1808.7
Eligibility has real limits. You cannot use traffic school if you already completed a course for another ticket within the prior 18 months, and it is unavailable for two-point violations, alcohol-related convictions, and violations committed in a commercial vehicle.9California Legislative Information. California Vehicle Code 1808.7 Request the traffic school option from the court before paying the fine; paying without requesting can forfeit eligibility. Traffic school does not erase the fine, and the court usually charges an administrative fee on top of the course cost.
If You Hold a Commercial Driver’s License
The stakes shift for CDL holders. Federal regulations classify speeding 15 mph or more over the limit as a “serious traffic violation,” and the designation applies even when the CDL holder was driving a personal vehicle.10Federal Motor Carrier Safety Administration. Disqualification of Drivers (383.51)
A single serious violation does not trigger disqualification. Two serious traffic violations within three years bring a minimum 60-day CDL disqualification, and three within three years bring a minimum 120-day disqualification.10Federal Motor Carrier Safety Administration. Disqualification of Drivers (383.51) Traffic school point-masking under CVC 1808.7 is not available to CDL holders.9California Legislative Information. California Vehicle Code 1808.7
How to Fight a CVC 22350 Ticket
Basic speed law tickets are more defensible than absolute-limit tickets because of how the statute is structured. Two approaches come up most often.
Challenging the Prima Facie Presumption
If your citation involved a prima facie limit, you can argue your speed was safe given the actual conditions. Useful evidence includes dashcam footage, weather reports from that day and time, photos of the road, and testimony about traffic density and visibility. Clear skies, dry pavement, no pedestrians, and light traffic support the claim that going a few miles over the posted number was reasonable. The right exists by statute, but the bar is high in practice and you carry the full burden of proof.4Justia. California Vehicle Code 22348-22366 – Article 1. Generally
The Speed Trap Defense
This is where a surprising number of tickets fall apart. Under Vehicle Code 40802, a “speed trap” includes any road where a prima facie speed limit is enforced by radar or other electronic device without a current engineering and traffic survey justifying that limit. The survey must have been conducted within five years before the alleged violation.11California Legislative Information. California Vehicle Code 40802
If the survey has expired or never existed, the radar evidence is inadmissible and the ticket may be dismissed. The defense does not apply to local streets, school zones, senior zones, or business activity districts, which are exempt from the survey requirement.11California Legislative Information. California Vehicle Code 40802 You can request the survey from the agency that controls the road. If they cannot produce a valid one, that is often enough to win in court.
Civil Liability After a Crash
The 22350 violation matters beyond the traffic ticket if it leads to a collision. California treats a speed violation as strong evidence of negligence in a personal injury or property damage lawsuit. If the other driver can show you were cited for unsafe speed at the time of the crash, the presumption is that your driving fell below the standard of care. You can rebut that presumption, but the violation shifts the burden to you to explain why your speed was not the cause. This is where the basic speed law carries its heaviest real-world weight: not the $234 fine, but potential civil liability for injuries and damage that resulted from driving too fast for conditions.