Learn how to react when a traffic light is out or malfunctioning. Treat it as a stop sign, follow right-of-way rules, and stay safe at dark intersections.
When a traffic light is out or malfunctioning, you should treat the intersection as an all-way stop sign -- come to a complete stop, then yield to the driver who arrived first or to the vehicle on your right.
It sounds simple enough, but dark intersections catch thousands of drivers off guard every year. The reality? Not everyone knows this rule, and that's exactly what makes these situations dangerous. The good news: once you understand the steps, you'll handle a dead traffic light with confidence every single time.
In this post, you'll learn the exact rules for out-of-service traffic signals, the most common mistakes drivers make, and practical tips to keep yourself safe when the lights go dark.
Key Takeaways
- Treat any out-of-service traffic light as an all-way stop sign -- this is the law in all 50 states.
- According to the NHTSA, roughly 2,564 fatal crashes occurred at signalized intersections in 2023.
- The first vehicle to reach a complete stop has the right of way. If two cars arrive at the same time, yield to the one on your right.
- A flashing red light means stop completely; a flashing yellow light means proceed with caution.
- Power outages caused approximately 10% of traffic signal failures in major U.S. metro areas in 2023, per the Federal Highway Administration.
Every state's traffic code includes a version of the same rule: when a traffic signal loses power or malfunctions, drivers must treat the intersection as if stop signs are posted on every approach.
Here's what that means in practice:
This rule applies whether the traffic light is completely dark, flashing erratically, or stuck on one color. If the signal isn't operating normally, the all-way stop rule kicks in.
Think about it: without a functioning signal, nobody knows who has the green. The all-way stop rule creates an orderly system that prevents chaos. According to the Insurance Institute for Highway Safety (IIHS), intersection crashes account for roughly 40% of all reported crashes in the United States. Remove the traffic signals from the equation, and that risk climbs even higher.
This is the most straightforward case. The traffic light has no power -- no colors showing at all. Marcus, a 19-year-old from Atlanta, told us he panicked the first time he encountered a dark signal during a thunderstorm. "I almost just drove through it because I didn't see any lights. Luckily, my mom was in the passenger seat and told me to stop."
Marcus did the right thing by stopping. A dark signal always means stop.
A flashing red light works exactly like a stop sign. You must come to a complete stop, check for traffic, and proceed when safe. This is commonly used at intersections during late-night hours when traffic volume is low.
A flashing yellow light means slow down and proceed with caution -- but you don't have to stop completely. You still need to watch for cross traffic that may have a flashing red on their side.
Sometimes a storm or electrical issue knocks out the signal for only one direction. If your light is working normally, follow it. But stay alert -- drivers on the cross street may not realize their signal is out and could run through the intersection.
Here's your action plan the next time you roll up to a dead traffic light:
| Step | Action | Why It Matters |
|---|---|---|
| 1 | Slow down as you approach | Gives you time to assess the situation |
| 2 | Come to a complete stop | Required by law at a dark signal |
| 3 | Check all directions | Pedestrians and cyclists may also be confused |
| 4 | Identify who stopped first | They have the right of way |
| 5 | If tied, yield to the right | Standard right-of-way rule |
| 6 | Proceed slowly through | Other drivers may not follow the rules |
The biggest mistake? Treating a dark intersection like an open road. Priya, a driving instructor in Phoenix, says she sees it constantly. "During monsoon season, we lose power to traffic lights all the time. At least once a week, I hear about a near-miss because someone blew through a dark intersection at full speed."
AAA's Foundation for Traffic Safety found that failure to yield right of way is a contributing factor in about 36% of intersection crashes. Learning to spot trouble before it happens is one of the best habits you can build. When the traffic light is out, that number gets even worse.
Never assume the driver across from you knows how to handle a broken traffic light. Defensive driving means preparing for the possibility that someone else will make a mistake. Even if it's your turn, check twice before you go.
Pedestrians are especially vulnerable at dark intersections. Without walk signals, they're guessing when to cross. Give them extra time and attention.
If you're studying for your permit test, expect at least one question about malfunctioning traffic signals. It's one of the most commonly tested road sign and signal topics on DMV exams across the country.
The typical question looks like this:
"When approaching an intersection where the traffic signal is not working, you should:"
The answer is always B.
Wheelingo's state-specific practice tests include questions like this one, tailored to your state's exact wording and format. If you want to make sure you don't miss it on test day, practice with real DMV-style questions on the Wheelingo app.
Sometimes when a traffic light goes out at a busy intersection, a police officer will step in to direct traffic manually. In this case, the officer's directions override all traffic signals and signs. Follow their hand signals, even if the light comes back on while you're in the intersection.
This is a commonly tested concept on the DMV exam, and it's an important rule to know for your road test as well.
| Feature | Wheelingo | DMV.org | Zutobi | Driving-Tests.org |
|---|---|---|---|---|
| State-specific signal questions | Yes | Limited | Yes | Yes |
| Explains the "why" behind rules | Yes | No | Partial | No |
| Free practice tests | Yes | No | No (paid) | Limited |
| Covers malfunctioning signals | Yes | Brief mention | Yes | Brief mention |
| Real DMV-format questions | Yes | No | Yes | Yes |
| Progress tracking | Yes | No | Yes | Basic |
Treat the intersection as an all-way stop. Come to a complete stop, yield to the vehicle that stopped first (or to your right if you arrived at the same time), and proceed only when it's safe.
Yes. In all 50 states, failing to stop at a non-functioning traffic signal is a traffic violation. You can be ticketed just as you would for running a stop sign.
If the cross traffic still has a working signal, you should still stop and treat your approach as if you have a stop sign. Wait for a safe gap in traffic before proceeding.
Not exactly. A flashing red means stop completely (like a stop sign). A flashing yellow means slow down and proceed with caution. A completely dark signal should be treated as an all-way stop.
Yes. Wheelingo offers free DMV practice tests for all 50 states. You can start practicing right now -- just download the app from the App Store and choose your state.
Wheelingo gives you state-specific questions that match your actual DMV test format. Unlike generic quiz apps, Wheelingo explains the reasoning behind each answer so you understand the rule -- not just memorize it. It also tracks your progress so you know exactly when you're ready for test day.
A traffic light going out isn't something you can predict, but it is something you can prepare for. The rule is straightforward: stop, look, yield, and go when it's your turn. Knowing this rule could save your life -- and it'll definitely help you pass your driving test.
If you want to master traffic signal rules and hundreds of other DMV topics, Wheelingo has you covered. Download the app from the App Store and start practicing today.
Last reviewed: June 29, 2026