Speed Cameras: How They Work and Where They're Legal

By I Go Cars · Updated October 29, 2026

What a speed camera is

A speed camera is an automated system that measures a vehicle's speed and photographs vehicles traveling above a set threshold, so that a citation can be issued to the registered owner without an officer stopping the car. It is one type of traffic enforcement camera, the broader category that also includes red-light cameras. Federal agencies now use the term speed safety cameras (SSC); the older term is automated speed enforcement (ASE).

The main federal operations document is the Speed Safety Camera Program Planning and Operations Guide, published in January 2023 by the Federal Highway Administration (FHWA) and the National Highway Traffic Safety Administration (NHTSA). An operations guide of this kind is advisory: it tells state and local agencies how to plan, run and evaluate a program; it does not authorize cameras anywhere. The 2023 guide describes itself as "an update of the Speed Enforcement Camera Systems Operational Guidelines" that FHWA and NHTSA published in 2008 (DOT HS 810 916).

Whether a camera can issue tickets in a given place is a question of state law, and sometimes local ordinance. That is covered below, with the caveat that this page describes what sources say and is not legal advice.

Fixed, mobile and point-to-point cameras

A March 2024 synthesis for the Minnesota Department of Transportation (MnDOT, report MN TRS 2402) describes three types of system:

Fixed: "a single, stationary camera that targets one location." Suited to a single known problem spot.
Mobile: "generally mounted on a vehicle or trailer," and suited to network-wide speeding problems, used at a location for short periods. The 2023 guide describes mobile units as vans or trailers.
Point-to-point (P2P): "P2P systems work by measuring the average vehicle speed between two sites." The 2023 guide calls it "average speed-over-distance, also called P2P enforcement." U.S. experience with it is limited.

The choice tracks the problem. A fixed camera addresses one location; mobile units spread enforcement across a road network; point-to-point measures sustained speed along a corridor rather than speed at one spot.

Measurement standards differ from patrol radar. NHTSA's down-the-road radar specification (DOT HS 812 266) excludes from its scope unmanned fixed-angle radars that "use circuitry to compensate for the reduction in displayed speed due to the cosine effect" (§1.3), the angle error that makes an angled reading low. No federal document setting calibration requirements for camera systems was found in research for this page.

What the evidence shows about crashes and speeding

Speeding is a large part of the U.S. crash problem. NHTSA counted 11,775 people killed in speeding-related crashes in 2023, 29% of all traffic fatalities. The Insurance Institute for Highway Safety (IIHS), in an October 2026 fact sheet, cites about 11,000 speeding deaths in 2024, also 29% of fatalities.

The same IIHS sheet summarizes the camera research. Speed cameras cut the share of drivers going more than 10 mph over the limit by 70% or more in Arizona, Maryland and Washington, D.C. In Montgomery County, Maryland, they reduced the likelihood that a crash involved an incapacitating or fatal injury by 39%. New York City's school-zone cameras cut crashes by 14% at camera sites. IIHS draws these from underlying studies (Hu and McCartt 2016; Retting et al. 2008; Gao et al. 2025).

The 2023 FHWA/NHTSA guide reaches a similar conclusion: speed safety cameras reduce fatalities and injuries by 20 to 37 percent; mobile units can reduce fatal and injury crashes on urban principal arterials by up to 20 percent; and on Arizona urban limited-access freeways, "Shin et al. (2009) found a 54-percent decrease in all crashes" with fixed units.

IIHS also reports approval rates of 62% to 77% where cameras are used effectively.

How programs set thresholds, warnings and penalties

Thresholds

No federal document sets a national ticketing threshold. The 2023 guide's Table 1 lists peer-city thresholds of 6 to 11 mph over the limit, and the MnDOT synthesis says thresholds are "typically set at 6, 10 or 11 mph above the speed limit." State law can set the figure; Florida's school-zone statute applies only to speeds more than 10 mph over the school-zone limit.

Warning periods

The 2023 guide says a pilot "would also benefit from a warning phase, during which warnings instead of actual citations are issued." Pennsylvania's automated speed enforcement program, for example, began with an "Initial 30-day warning period," according to the MnDOT synthesis.

Penalties and points

A common belief is that a camera ticket never carries license points. The 2023 guide says violations "may be treated as civil infractions," but that depending on state or local law they "may be considered moving violations" that can carry points. The answer depends on the state.

Revenue and equity

The guide states that "SSC programs should be transparent about the use of revenue from citations" and recommends "dedicating revenue to infrastructure improvements that encourage more appropriate speeds." On siting, agencies "should work to ensure that there is no discrimination in the siting of SSC or burden of penalties."

Federal guidance and its changing status

FHWA had listed speed safety cameras among its Proven Safety Countermeasures, a list of road-safety measures the agency highlights for state and local agencies. That changed in 2026. According to Smart Cities Dive, citing NPR, FHWA removed speed safety cameras, along with four other measures, from the list without public explanation; the change was reported on July 16 and 17, 2026. This is press reporting; no FHWA statement on the removal was found.

FHWA's Speed Safety Cameras FAQ page, which had described SSC as "one of 28 proven safety countermeasures," is marked "Rescinded" and was last updated May 22, 2025. Whether the January 2023 FHWA/NHTSA guide has itself been withdrawn has not been confirmed. The belief that the federal government currently endorses speed cameras is therefore out of date as a statement of FHWA's list, even though the 2023 guide's evidence summary has not been contradicted by a federal source.

The 2008 guidelines still matter in one place: the FAST Act's state survey requirement compares programs against them, according to the MnDOT synthesis.

Where speed cameras are legal

Counts differ by source and by what is being counted, so each figure below carries its source and date.

States that permit them (GHSA)

The Governors Highway Safety Association (GHSA), the association of state highway safety offices, says in its state law summary (last updated October 2025) that "19 states and the District of Columbia" permit speed cameras. Its individual state entries list about 21 states as permitting them, often with limits: Alabama (specified jurisdictions), Arizona (not on state highways), Arkansas (school, rail and work zones, with an officer issuing the citation at the time), California (seven jurisdictions, in a pilot running to January 1, 2032), Colorado (officer or employee present), Connecticut (from October 1, 2023), D.C. (citywide), Georgia (school zones), Illinois (work zones with workers present; school and park safety zones), Indiana (highway work zones), Louisiana, Maryland (school zones, certain residential roads, work zones), Nevada (only handheld or in a police vehicle or facility), New Mexico, New York (specified jurisdictions), Ohio (statewide), Oregon (statewide since January 1, 2023, with an officer in a marked vehicle), Pennsylvania (work zones and Philadelphia), Rhode Island (school zones), Tennessee (school zones and S-curves), Virginia (school crossing and work zones) and Washington (school, park, hospital and work zones, and priority areas). The gap between the headline and the entries may reflect states such as Arkansas and Nevada that permit cameras only with an officer present or handheld; GHSA does not explain it.

States that prohibit them (GHSA)

GHSA lists ten: Idaho, Maine, Mississippi, New Hampshire, New Jersey, South Carolina, Texas, Utah, West Virginia and Wisconsin.

States with no state law

In many remaining states GHSA records no state law, and some cities run programs by local ordinance (GHSA notes Iowa and Missouri). A state without an authorizing statute is not necessarily a state without cameras.

Florida: the statute and GHSA disagree

GHSA lists Florida as having no state law or programs. The statute says otherwise. Fla. Stat. 316.1896, enacted through 2023 HB 657, authorizes counties and municipalities to use school-zone speed detection systems for speeds "in excess of 10 miles per hour over the school zone speed limit," within 30 minutes before and after school sessions and during the session, with a $100 penalty. This page follows the statute.

Communities using cameras (IIHS)

IIHS reports that, as of October 2026, more than 350 communities in 26 states plus D.C. use speed safety cameras. That figure counts local programs, including some operating without explicit state authorization, so it is higher than GHSA's count of permitting states. Readers should check the current statute in their own state.

Frequently asked questions

Which states ban speed cameras?

Ten states prohibit speed cameras, according to the Governors Highway Safety Association's state law summary (last updated October 2025): Idaho, Maine, Mississippi, New Hampshire, New Jersey, South Carolina, Texas, Utah, West Virginia and Wisconsin. Laws change, so check the current statute in your state before relying on this list.

How many states allow speed cameras?

GHSA says 19 states and the District of Columbia permit speed cameras by law, though its own state-by-state entries list about 21 states. IIHS counts more than 350 communities in 26 states plus D.C. using them as of October 2026, a figure that includes local programs where state law is silent.

Do speed cameras reduce crashes?

Yes, according to federal and insurance-industry research. The 2023 FHWA/NHTSA guide reports 20 to 37 percent fewer fatalities and injuries. IIHS reports speed cameras cut drivers going more than 10 mph over by 70 percent or more in Arizona, Maryland and D.C., and cut crashes 14 percent at New York City school-zone camera sites.

How fast do you have to go to get a speed camera ticket?

It depends on the program, and no national threshold exists. A 2024 Minnesota DOT synthesis says thresholds are typically 6, 10 or 11 mph over the limit, and the 2023 FHWA/NHTSA guide lists peer-city thresholds of 6 to 11 mph. Florida's school-zone statute applies only to speeds more than 10 mph over the posted limit.

Do speed camera tickets add points to your license?

It depends on state law. The 2023 FHWA/NHTSA guide says camera violations may be treated as civil infractions, but that under some state or local laws they may be considered moving violations that carry license points. Check your state's statute for how camera citations are classified.

What is a point-to-point speed camera?

A point-to-point camera system measures a vehicle's average speed between two sites rather than its speed at one spot. The 2023 FHWA/NHTSA guide calls it average speed-over-distance enforcement. A 2024 Minnesota DOT synthesis notes that U.S. experience with point-to-point systems is limited.

Does Florida have speed cameras?

Yes, in school zones. Fla. Stat. 316.1896, enacted through 2023 HB 657, lets counties and municipalities use school-zone speed detection systems for speeds more than 10 mph over the school-zone limit, around and during school sessions, with a $100 penalty. GHSA's summary lists Florida as having no state law, which conflicts with the statute.

Speed cameras: types, evidence and state law