At any intersection, what to do comes down to the same short sequence: read the signal or sign in front of you, work out who has the right-of-way, signal your intention early, and yield to pedestrians and cyclists before you move. The rest is detail, and the detail matters most at the signal types people see least often, like flashing yellow arrows and pedestrian hybrid beacons.
What the Signal in Front of You Means
A steady green light lets you proceed straight, turn left, or turn right, but you still yield to pedestrians in the crosswalk and to any vehicle already in the intersection. If you’re turning left on a green ball, you also yield to oncoming traffic close enough to be a hazard.1Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4D – Traffic Control Signal Features
A steady yellow warns that the green is ending and a red is coming. Stop if you can do so safely; if you’re already too close, proceed through carefully. A steady red means stop at the stop line, at the near edge of the crosswalk, or before the intersection itself if neither is marked, and stay stopped until you get a green or another signal releases you.1Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4D – Traffic Control Signal Features
A flashing red works like a stop sign: full stop, check the intersection, go when it’s clear. A flashing yellow means slow down and proceed with caution; you don’t have to stop, but be ready to.
Arrow Signals
Arrows control a specific turning movement rather than all traffic on your approach. A solid green arrow is a protected turn in that direction. Oncoming traffic should have a red, but you still yield to pedestrians in the crosswalk and to anyone already in the intersection. A solid yellow arrow means the protected phase is ending. A solid red arrow means you cannot make that turn, and in most places you cannot turn on it at all unless a sign specifically allows it.1Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4D – Traffic Control Signal Features
The flashing yellow arrow is the one drivers most often misread. It means you may turn, but oncoming traffic has a green, so you must yield to oncoming vehicles and to pedestrians before turning. Treat it as a “turn if the way is clear” signal and wait for a safe gap.1Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4D – Traffic Control Signal Features
Stop Signs, Yield Signs, and Intersections With Nothing at All
A stop sign requires a full stop before the marked line or crosswalk. A full stop means your wheels are no longer moving. A slow roll is not a stop, and it is one of the most frequently ticketed intersection violations. Once you’ve stopped, check all directions and go when the intersection is clear.
A yield sign requires you to slow down, look for crossing traffic and pedestrians, and give way to anyone who has the right-of-way. You don’t have to stop if nothing is coming, but you have to be ready.
Some intersections have no signals, signs, or markings at all. These uncontrolled intersections are most common in low-volume residential areas, and they rely entirely on the right-of-way rules below. Slow down when you approach one and be ready to stop, because the driver on the other street may not know the rules either.
Who Goes First
Right-of-way rules decide the question that causes most intersection confusion: who goes first. The core principles are consistent across the country.
- A vehicle already in the intersection has priority over one that hasn’t entered yet.
- At an all-way stop or an uncontrolled intersection, the vehicle that arrives first goes first.
- When two vehicles arrive at the same time from different directions, the driver on the left yields to the driver on the right.
- A driver turning left yields to oncoming traffic going straight or turning right, even if the left-turning vehicle got there first. This is the rule people miss most often.
- When an emergency vehicle approaches with lights and siren, pull to the right edge of the road and stop until it passes.
Right-of-way is something you yield, not something you take. Even when the rules put you first, if another driver is already moving through, let them finish and go when it’s safe.
Right Turn on Red
All 50 states allow a right turn on a steady red circular signal after a complete stop, unless a sign at the intersection prohibits it. You must yield to pedestrians in the crosswalk and to any vehicles with a green signal before you complete the turn.1Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4D – Traffic Control Signal Features A driver on a one-way street turning left onto another one-way street can turn on red under the same conditions.
A red arrow is different. At most intersections it prohibits the turn entirely, though some jurisdictions post signs allowing turns on a red arrow. If no sign grants permission, treat a red arrow as a hard stop with no turn.1Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4D – Traffic Control Signal Features
Turning Safely
Signal early. Most states require you to activate your turn signal at least 100 feet before the turn, roughly five or six car lengths, and some require more distance at higher speeds. The point is to give other drivers time to react.
For a right turn, move into the rightmost lane well before the intersection and complete the turn into the nearest lane of the cross street. For a left turn, use the leftmost turn lane and finish in the leftmost available lane on the new road. Cutting across multiple lanes mid-turn is one of the fastest ways to cause a side-swipe.
Slow down before the intersection, not inside it. Check your mirrors and blind spots. Look for pedestrians stepping off the curb. Watch for cyclists coming up on your turning side, which is easy to miss in a mirror on a right turn where your vehicle crosses a bike lane.
Large Vehicles
Trucks, buses, and vehicles pulling trailers need more room to turn than a passenger car. A tractor-trailer making a right turn may swing left into an adjacent lane before cutting back right. Don’t try to squeeze past a large vehicle on its turning side.
Roundabouts
A roundabout is a circular intersection where everyone entering yields to vehicles already circulating. Traffic flows counterclockwise around a central island.2Federal Highway Administration. Roundabouts – An Informational Guide At the yield line where your approach meets the circle, look left. If a gap is open, merge in without stopping; if traffic is flowing, wait for one.
Once you’re inside, hold a steady low speed and don’t stop unless you need to avoid a collision. Signal right as you approach your exit so drivers waiting to enter know you’re leaving. If you miss your exit, go around again. Backing up or cutting across the central island is illegal.3Federal Highway Administration. Roundabouts – An Informational Guide
Pedestrians and Cyclists
Pedestrians in a crosswalk have the right-of-way at virtually every intersection. That includes unmarked crosswalks, which legally exist at most intersections even without paint. When the walk signal is lit, pedestrians may enter, and drivers turning across the crosswalk wait for them to clear. A flashing “don’t walk” tells pedestrians not to start, but anyone already in the crosswalk has the right to finish.4Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4E – Pedestrian Control Features
Never pass a vehicle stopped for a pedestrian in a crosswalk. The stopped car blocks your view of the pedestrian and the pedestrian’s view of you. It’s illegal in most jurisdictions and accounts for a disproportionate share of fatal pedestrian crashes.
Cyclists follow the same traffic laws as motor vehicles in all 50 states. Give them extra attention on turns, especially right turns. A cyclist traveling straight in a bike lane to your right has the right-of-way over your right turn across that lane.
Pedestrian Hybrid Beacons
Pedestrian hybrid beacons, sometimes called HAWK signals, show up at midblock crossings and intersections without full traffic signals. They stay dark until a pedestrian presses the button, which is why they catch drivers off guard the first time.5Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4F – Pedestrian Hybrid Beacons The sequence runs in four phases:
- Flashing yellow: the beacon has been activated. Slow down and prepare to stop.
- Steady yellow: red is coming. Stop if you can do so safely.
- Steady double red: full stop. Pedestrians have the walk signal.
- Alternating flashing red: the walk phase has ended. Stop, then proceed if no pedestrians remain in the crosswalk.
After the alternating red phase, the beacon goes dark again.5Manual on Uniform Traffic Control Devices. 2009 Edition Chapter 4F – Pedestrian Hybrid Beacons The alternating red phase is the one that trips people up. It works like a stop sign: stop, confirm the crosswalk is clear, and go. You don’t have to wait for it to turn off.
When the Signal Is Dark or an Officer Is Directing
Power outages and equipment failures leave intersections with completely dark signals. The rule most state traffic codes impose is to treat a dark signal as an all-way stop. Every driver, from every direction, comes to a full stop and then follows the standard right-of-way rules: first to arrive goes first, simultaneous arrivals yield to the right. The FHWA recommends agencies deploy portable stop signs at these intersections to reinforce the requirement.6Manual on Uniform Traffic Control Devices. Use of Folding Stop Signs for Traffic Signal Power Outages
When a police officer or other authorized person is directing traffic, their instructions override any signal, sign, or pavement marking. If an officer waves you through a red, you go. If they hold up a hand while your light is green, you stop. Ignoring a traffic officer’s directions is a moving violation in every state.
Don’t Enter an Intersection You Can’t Clear
One of the most overlooked rules is also the simplest: don’t enter the intersection unless you have room to get all the way through. Getting caught in the middle when the light changes blocks cross traffic and puts you in the path of vehicles that now have a green. Many cities mark these intersections with painted boxes and “Don’t Block the Box” signs, and the fines are steep.
The test is quick. Before you enter, look at the far side. Is there enough room for your entire vehicle past the crosswalk? If traffic is backed up and the answer is no, wait behind the stop line even though your light is green. A green light gives you permission to enter the intersection. It doesn’t require you to.