Red Light Cameras: How They Work and What a Ticket Means

How do red light cameras work?

A red light camera only records a violation when a vehicle enters the intersection after the signal has turned red. The Insurance Institute for Highway Safety (IIHS) explains that the cameras are connected to the traffic signal and to sensors near the stop line, and they capture any vehicle that does not stop during the red phase ^[1].

IIHS notes that many programs allow a grace period of up to half a second after the light turns red, and that trained staff review each image before a ticket goes out ^[1].

Florida law shows how the review works in practice. Before a citation is issued, an authorized employee or agent of the state, county or city reviews the information from the camera, and the owner must be notified within 30 days after the violation ^[3]. In Tennessee, a POST-certified police officer must review the evidence before a violation is determined ^[4].

Who gets the notice depends on the program. Many cameras read only the license plate, so the notice goes to the registered owner, as in Florida. Some California cities photograph the front of the vehicle so the driver can be identified; Merced says its images show the driver ^[5]. That choice shapes everything that follows, including whether points can apply.

What does a red light camera ticket mean?

It depends on the state and the type of notice. Some red light camera notices are civil fines against the vehicle owner, while others are court citations that can add a point to the driver's license. The difference matters more than the fine.

Here are official examples, as of November 2026:

Where	Penalty	Points
Florida	Owner must pay a $158 penalty, file an affidavit or request a hearing [3]	Check with the Florida DMV
Tennessee	Fine on the notice cannot exceed $50 [4]	Check with the Tennessee DMV
Merced, California	Court sends the total bail amount due [5]	A Notice to Appear adds 1 point
Arizona (Scottsdale)	Civil traffic violation, fines set by the city court [6]	2 points per red light conviction

California is the clearest example of why the notice type matters. The City of Merced says its Notice to Appear applies one point to the liable party's license, while a Notice of Violation carries no points because it is not filed with the court. Merced's cameras photograph the front of the vehicle so the driver is shown, and a registered owner who was not driving can name the driver with an Affidavit of Non-Liability ^[5].

In Scottsdale, Arizona, each red light conviction is assigned two points, but a driver who has not used the defensive driving option in the past 12 months can use it to avoid them ^[6].

Points can affect your insurance too. Our guide to how a ticket affects insurance explains the factors, and the points calculator shows what a violation adds in your state.

Can you get a red light camera ticket for turning right on red?

Sometimes. The rules differ by state, so read the notice and your state law.

• Florida: a camera ticket may not be issued for failing to stop when the driver turns right in a careful and prudent manner at an intersection where right turns are allowed ^[3].
• Tennessee: a camera-only ticket for an unlawful right turn on red needs a clearly marked No Turn on Red sign. For failing to stop before the turn, the evidence must show the front tire before the stop line and then the rear tire past it while the signal is red ^[4].
• Merced, California: a right turn ticket means the video shows the driver did not come to a complete stop before turning ^[5].

The safe rule everywhere is the one in the driver handbook: stop fully at the line, then turn only when the way is clear and no sign forbids it.

Where are red light cameras legal?

Red light camera rules are set state by state, and many states leave the decision to cities. IIHS counted 351 U.S. communities with red light camera programs in 2025 and notes that the number has declined since 2012 ^[1]. IIHS also keeps a state law table that is a useful cross-check ^[2].

Some examples from official sources, as of November 2026:

• Banned in Maine: the state and towns may not use traffic surveillance cameras to enforce traffic laws, with exceptions only for school bus cameras and turnpike tolls ^[7].
• Allowed in Florida: the state, counties and cities can run red light cameras under a single state process with a fixed $158 penalty ^[3].
• Allowed with rules in Tennessee: a city must complete a traffic engineering study, certified by a licensed engineer, before installing a new camera ^[4].

Other states have no camera law at all, which leaves cities and courts to sort it out. Our traffic camera laws by state page shows each state's current status with its statute and the date we checked it. Speed cameras follow their own rules; see our speed camera guide.

What should you do if you get a red light camera notice?

Start with the deadline. Florida gives the owner 60 days from the notice to pay, file an affidavit or request a hearing ^[3]. Other places set different deadlines, and missing one can add fees or turn a civil notice into a court citation.

Then look at your options:

1. Review the evidence. Most notices link to the photos and video. Check that the plate, the vehicle and the signal phase match.
2. Pay through the official city, county or court website printed on the notice. Avoid third-party payment sites.
3. Name the driver if someone else was driving and your state allows it, such as with Merced's Affidavit of Non-Liability ^[5].
4. Request a hearing if you believe the notice is wrong. In Florida, a local hearing officer reviews the images or video at the hearing ^[3].
5. Ask about traffic school if the ticket carries points. In Merced, the judge decides eligibility for defensive driving school ^[5].

If the ticket could push you toward a license suspension, or you hold a commercial driver's license, talking to a licensed attorney in your state makes sense. Our state ticket guides and license points guide explain the rules for each launch state.

Do red light cameras reduce crashes?

The best U.S. evidence says yes, in large cities. IIHS reports that 1,119 people were killed in crashes involving red light running in 2024, and more than 141,000 were injured ^[1].

The IIHS study by Hu and Cicchino (2017) found cameras reduced the fatal red light running crash rate in large cities by 21% and the rate of all fatal crashes at signalized intersections by 14%. In 14 large cities that turned their cameras off between 2010 and 2014, the fatal red light running crash rate was 30% higher than expected ^[1]. Cameras are not the only tool: signal timing and intersection design matter too.