In a California construction zone, the speed limit is usually 10 mph lower than the normal posted limit on that stretch of road, and it can’t be set below 25 mph. The reduced limit is enforceable when workers are present or when traffic is being regulated through the zone under an approved traffic control plan. Get caught speeding there and your fine moves up one category on the state’s penalty schedule: a ticket that would normally run about $234 climbs to roughly $363, and the violation still puts a point on your driving record.
How the Reduced Limit Is Set
Two statutes do the work. Vehicle Code 21367 lets Caltrans and local authorities restrict or regulate traffic through any area where road work could endanger workers or interfere with traffic flow, using signs, signals, control devices, or flaggers.1California Legislative Information. California Vehicle Code 21367 – Regulation of Traffic at Construction Sites Vehicle Code 22362 handles the speed side: it’s a violation of the basic speed law to exceed the posted limit on any stretch of highway where agency workers or contractors are on or near the roadway and could be endangered by passing traffic. Signs showing the reduced limit and the boundaries of the zone must be placed within 400 feet of each end of the construction area, and the posted limit cannot drop below 25 mph.2California Legislative Information. California Vehicle Code 22362 – Speed Limit Where Workers Present
Standard Caltrans practice is a 10 mph reduction. If conditions call for a bigger drop, the limit is stepped down in 10 mph increments through successive signs rather than cut all at once. On a 55 mph highway that needs a 35 mph work zone, drivers see 55, then 45, then 35. Any reduction beyond the standard 10 mph requires approval from a Caltrans district director along with documented justification.3California Department of Transportation. California Manual for Setting Speed Limits
When the Lower Limit Is Actually Enforceable
The reduced speed limit under Vehicle Code 22362 is tied to worker presence. It applies when agency employees or contractors are working on the roadway or close enough to be at risk from passing vehicles.2California Legislative Information. California Vehicle Code 22362 – Speed Limit Where Workers Present Caltrans policy backs this up: temporary speed limit signs are supposed to be covered or removed during inactive periods and when temporary traffic controls are taken down for the day.3California Department of Transportation. California Manual for Setting Speed Limits
So if the reduced-speed signs are uncovered and visible, treat the lower limit as enforceable. If you drive through on a weekend or at night and the signs are covered or removed, the normal posted limit is back in effect. Either way, California’s basic speed law still requires driving at a speed that’s safe for current conditions. Narrowed lanes, concrete barriers, uneven pavement, and shifted traffic patterns can all justify a ticket even when no reduced limit is posted.4California Legislative Information. California Vehicle Code 22350 – Basic Speed Law
What a Ticket Costs
Construction zone fines aren’t simply doubled, despite what you’ll read in a lot of places. Under Vehicle Code 42009, an infraction committed in a work zone moves up one category on the state’s Uniform Bail and Penalty Schedule. Only misdemeanor traffic offenses get the full doubling treatment. The enhancement applies when traffic is being regulated through the zone under a Section 21367 plan, or when workers are actually performing construction or maintenance in the area.5California Legislative Information. California Vehicle Code 42009 – Highway Construction or Maintenance Area Offenses
Here’s what the category bump looks like in real dollars. California’s 2025 Uniform Bail and Penalty Schedule sets total fine amounts, including base fine plus all mandatory penalty assessments, surcharges, and fees:6California Courts. Uniform Bail and Penalty Schedules
- 1 to 15 mph over: about $234 normally, roughly $363 in a construction zone.
- 16 to 25 mph over: about $363 normally, roughly $486 in a construction zone.
- 26+ mph over: about $486 normally, bumped to the next enhanced category in a construction zone.
Those totals climb further if you have prior moving violations in the last three years (each adds $10 to the base fine), and missing the payment deadline adds a 50 percent late charge.6California Courts. Uniform Bail and Penalty Schedules
Speeding Over 100 mph
Driving over 100 mph anywhere in California is a separate offense under Vehicle Code 22348(b) with its own penalty structure: up to $500 for a first offense, up to $750 for a second within three years, and up to $1,000 for a third within five years. The court can suspend your license for up to 30 days on a first offense, and the DMV will suspend it for subsequent offenses. In a construction zone, these penalties get the enhancement treatment on top.7California Legislative Information. California Vehicle Code 22348 – Speed Laws
The Point on Your Record
A construction zone speeding ticket adds one point to your California driving record, the same as any standard moving violation. California doesn’t assess extra points for the construction zone enhancement itself. Speeding over 100 mph is the exception at two points, regardless of where it happens.8California Legislative Information. California Vehicle Code 12810 – Violation Point Count
Points accumulate. The DMV’s negligent operator program suspends your license if you reach four points in 12 months, six in 24 months, or eight in 36 months. The action is a one-year probation period that includes a six-month suspension.9California DMV. Negligent Operator Actions One work zone ticket rarely trips those thresholds on its own, but if you already have points, it can be the one that pushes you into a hearing.
Traffic School
Most drivers can attend traffic school to keep the point off their record. You need a valid driver’s license, a ticket issued while driving a noncommercial vehicle, and no traffic school attendance in the previous 18 months.10California Courts. Traffic School Traffic school doesn’t erase the fine, but masking the point can prevent insurance rate increases and keep you further from the negligent operator thresholds. Request it from the court before or at the time you pay.
Fighting the Enhancement
Most work zone tickets are fought not on the speed reading but on whether the Vehicle Code 42009 enhancement was properly applied. Knock the enhancement out and you’re back to the regular speeding fine, often a difference of $100 or more.
Signage That Doesn’t Meet the Statute
Vehicle Code 22362 requires signs showing the reduced limit and the boundaries of the zone to be placed within 400 feet of each end of the construction area.2California Legislative Information. California Vehicle Code 22362 – Speed Limit Where Workers Present If signs were missing, obscured by equipment, knocked over, or placed too far from the zone, the reduced limit wasn’t legally established. Photographs from a dashcam or taken shortly after the stop carry the most weight.
No Workers Actually Present
Because the reduced limit under Vehicle Code 22362 depends on workers being on or near the roadway, a ticket written when no one was working can be challenged. Caltrans policy requires temporary speed limit signs to be covered or removed during inactive periods, so uncovered signs with no crew on site points to a failure on the agency’s end.3California Department of Transportation. California Manual for Setting Speed Limits This defense is strongest late at night or on weekends. Time-stamped photos or video of the empty zone help.
Even if you beat the enhancement, the basic speed law still applies. An officer can argue you were driving too fast for conditions given the physical hazards, no matter what the signs said.
Genuine Emergency
California recognizes a limited necessity defense. If you exceeded the limit to avoid imminent danger or respond to an urgent medical situation with no reasonable alternative, you may be able to argue it. The bar is high: the threat has to be immediate, speeding has to be the only reasonable option, and you can’t have been reckless about it. Transporting someone with a life-threatening injury when calling 911 wasn’t viable is the kind of scenario where this defense has real traction. Running late for work is not.
Flaggers and Traffic Control Devices
Speeding isn’t the only way to pick up the enhanced penalty. Vehicle Code 21367 makes it unlawful to disobey a flagger directing traffic or ignore warning signs, signals, and control devices set up under a traffic control plan.1California Legislative Information. California Vehicle Code 21367 – Regulation of Traffic at Construction Sites Blowing past a flagger holding a slow sign or ignoring lane closure cones is a separate violation that also triggers the enhanced penalty structure under Vehicle Code 42009.5California Legislative Information. California Vehicle Code 42009 – Highway Construction or Maintenance Area Offenses Unlike speeding, which often turns on a radar reading, these violations rest on officer observation and can be harder to contest.