What Is the Speed Limit in a Construction Zone in California?

In a California construction zone, the speed limit in a construction zone in California is typically 10 mph below the normal posted limit when workers are on or near the roadway, and it can never be set below 25 mph. Get caught speeding through one and your fine jumps up one penalty category: a ticket that would run about $234 on open highway climbs to roughly $363 inside the zone. The point on your record is the same as any other speeding ticket, but the dollar hit is bigger, and the enhancement applies whether or not you saw a worker.

How the Reduced Limit Gets Set

Two statutes do the work. Vehicle Code 21367 lets Caltrans and local agencies regulate traffic through any area where road work could endanger crews or snarl traffic, using signs, lights, control devices, or flaggers.¹ Vehicle Code 22362 handles enforcement: it violates the basic speed law to exceed the posted limit on a stretch of highway where agency workers or contractors are on or near the road and exposed to passing traffic. Signs showing the reduced limit and the zone boundaries must sit within 400 feet of each end of the construction area, and the posted limit cannot drop below 25 mph.²

Caltrans standard practice is a 10 mph reduction. When conditions call for a bigger drop, the limit has to step down in 10 mph increments through successive signs rather than plunging all at once. On a 55 mph highway where crews need a 35 mph zone, you’ll see 55, then 45, then 35.³

When the Lower Limit Actually Applies

Section 22362’s reduced limit is tied to worker presence. It kicks in when agency employees or contractors are working on the roadway or close enough to be at risk from passing cars.² Caltrans policy requires temporary speed limit signs to be covered or physically removed during inactive periods or when temporary traffic controls come down for the day.³

If the reduced-speed signs are uncovered and visible, assume the lower limit is enforceable. If you pass through a work area on a weekend or late at night and the signs are covered or gone, the normal posted limit applies. Even then, California’s basic speed law requires you to drive at a safe speed for conditions, and construction zones often keep narrowed lanes, concrete barriers, shifted traffic patterns, and uneven pavement in place long after crews leave.⁴

What a Ticket Actually Costs

Construction zone fines are not simply doubled, despite what you’ll read in some older writeups. The penalty bump depends on how the violation is charged. Most speeding tickets are infractions, and Vehicle Code 42009 moves infraction fines up one category on the state’s Uniform Bail and Penalty Schedule. Full doubling only applies to misdemeanor traffic offenses. The enhancement triggers in two situations: when traffic is being regulated under a Section 21367 traffic control plan, or when workers are actually performing construction or maintenance.⁵

In dollar terms, the 2025 Uniform Bail and Penalty Schedule totals (base fine plus all assessments, surcharges, and fees) look like this:⁶

1 to 15 mph over: about $234 normally, roughly $363 in a work zone.
16 to 25 mph over: about $363 normally, roughly $486 in a work zone.
26 mph or more over: about $486 normally, bumped to the next enhanced category in a work zone.

Prior moving violations within the past three years add $10 to the base fine for each prior conviction. Miss the payment deadline and a 50 percent late charge gets tacked on.

Driving Over 100 mph

Breaking 100 mph anywhere in California is a separate offense under Vehicle Code 22348(b): 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. A court can suspend your license for up to 30 days on a first offense, and the DMV will suspend it for subsequent offenses. The construction zone enhancement stacks on top.⁷

Points and License Risk

A construction zone speeding ticket puts one point on your California driving record, the same as any other standard speeding violation. California does not add extra points for the zone enhancement. The exception is speeding over 100 mph, which carries two points regardless of where it happens.⁸

One point looks minor on its own. Points compound. The DMV’s negligent operator program can suspend your license at four points in 12 months, six in 24 months, or eight in 36 months, with a one-year probation period that includes a six-month suspension.⁹ If you already carry points from earlier tickets, a work zone citation can be the one that pushes you into a hearing.

Keeping the Point Off With Traffic School

Most drivers can attend traffic school to mask the point from a speeding conviction. The general requirements are a valid driver’s license, a ticket issued while driving a noncommercial vehicle, and no traffic school attendance in the previous 18 months.¹⁰ Traffic school doesn’t erase the fine, but hiding the point can protect your insurance rate and keep you further from the negligent operator thresholds. Ask the court before or when you pay.

Fighting the Ticket

Most construction zone tickets get challenged on whether the Section 42009 enhancement was properly applied, not on the underlying speed reading. Beat the enhancement and you still face the regular speeding fine, but the gap can run $100 or more.

Signage Problems

Vehicle Code 22362 requires signs showing the reduced limit and the zone boundaries within 400 feet of each end of the construction area.² If the signs were missing, knocked over, obscured by equipment, or placed too far out, the reduced limit was never legally established. Dashcam footage or photos taken shortly after the stop carry the most weight. Officers don’t always note sign placement in their reports.

No Workers Present

Section 22362 ties the reduced limit to workers being on or near the roadway, and Caltrans policy requires temporary signs to be covered or removed during inactive periods.³ A citation issued when the zone was empty, with uncovered signs still up, points to an agency failure. The defense works best late at night or on weekends when activity is unlikely. Time-stamped photos or video of the empty zone help. Keep in mind the basic speed law still applies, and an officer can argue you were driving too fast for conditions given the physical hazards in the zone.

Genuine Emergency

California recognizes a narrow necessity defense. You’d need to show the threat was immediate, that speeding was the only reasonable option, and that you weren’t reckless about it. Driving someone with a life-threatening injury when calling 911 wasn’t viable is the kind of situation where this gets traction. Running late is not.

Flaggers and Control Devices

Speeding is not the only way to pick up an enhanced work zone penalty. Vehicle Code 21367 makes it unlawful to disobey a flagger directing traffic or to ignore warning signs, signals, and control devices set up under a traffic control plan.¹ Blowing past a flagger with a slow sign or running through lane closure cones is a separate violation that also triggers the Section 42009 enhancement.⁵ These charges rest on officer observation rather than a radar reading, which makes them harder to contest than a straight speeding ticket.

1
California Legislative Information. California Vehicle Code 21367 – Regulation of Traffic at Construction Sites
2
California Legislative Information. California Vehicle Code 22362 – Speed Limit Where Workers Present
3
California Department of Transportation. California Manual for Setting Speed Limits
4
California Legislative Information. California Vehicle Code 22350 – Basic Speed Law
5
California Legislative Information. California Vehicle Code 42009 – Highway Construction or Maintenance Area Offenses
6
California Courts. Uniform Bail and Penalty Schedules
7
California Legislative Information. California Vehicle Code 22348 – Speed Laws
8
California Legislative Information. California Vehicle Code 12810 – Violation Point Count
9
California DMV. Negligent Operator Actions
10
California Courts. Traffic School