At a three-way intersection, right of way follows the signs or signals in place: stop when you face a stop sign, yield when you face a yield sign, and obey the signal when one is lit. If no device controls the junction, the driver on the dead-end stem of a T yields to traffic on the through road, and when two drivers arrive together with no clear through road, the driver on the left yields to the driver on the right. The three-way intersection rules below walk through each situation you’re likely to face, plus what happens if a crash puts fault in question.
Three-way junctions come in two shapes. A T-intersection is where one road dead-ends into another at roughly a right angle; the dead-end leg is the stem, and the road it meets is the through road. A Y-intersection is where three roads meet at diagonal angles with no obvious through road. The shape matters because it changes who the law expects to yield.
Right of Way With No Sign or Signal
Uncontrolled three-way intersections usually sit on low-volume residential or rural roads. Two default rules decide who goes first.
At a T-intersection, the stem driver yields to all traffic on the through road. The Uniform Vehicle Code, the model law most states draw from, puts it plainly: a driver entering a roadway from any place other than another roadway must yield to vehicles already on that roadway. In practice, you wait on the stem for a safe gap in both directions before turning. Pulling out in front of through traffic is a failure-to-yield violation in every state, with fines commonly running from around $100 to $500 or more depending on jurisdiction.
At a Y-intersection, or any three-way junction where neither road is clearly the through road, the rule shifts. If two vehicles arrive at the same time, the driver on the left yields to the driver on the right. If one vehicle gets there first, that vehicle goes first.1NHTSA. Right-of-Way Rules These are defaults only. Any posted sign or signal overrides them.
What to Do at Signed or Signaled Three-Way Intersections
Most three-way junctions with meaningful traffic carry some kind of control device. What you see as you approach tells you what the law requires.
Two-way stop. The stem of a T-intersection has stop signs; the through road does not. You stop completely, check both directions, and enter only when safe. Through-road drivers do not stop.
Three-way (all-way) stop. Every approach has a stop sign. You proceed in the order drivers arrived. When two stop at the same moment, the one on the right goes first.
Yield sign. You slow and merge without a full stop if the way is clear. Under federal standards, yield signs are not placed on every approach to an intersection except at roundabouts, so at a three-way junction a yield sign will face only one or two approaches.2FHWA. MUTCD 11th Edition – Chapter 2B
Traffic signal. Red, yellow, and green lights manage higher-volume junctions. Running a red light is a serious violation on its own, and red-light running contributed to 1,272 fatalities nationally in 2022.3FHWA. About Intersection Safety
Disobeying a stop sign or red light adds points to your driving record in every state, though the exact number varies. A basic stop-sign violation might carry 2 points; the number climbs if circumstances rise to reckless driving. Enough points, and you face license suspension.
Channelized Right Turns (Slip Lanes)
Some three-way intersections include a separate curved lane called a slip lane that lets you turn right without entering the main junction. Slip lanes usually have their own yield sign. You yield to traffic already established in the lane you’re merging into. If a signal controls the slip lane, treat a red light as a stop sign: come to a full stop, then proceed when clear.
The hidden hazard is pedestrians. You’re looking left for a traffic gap while people may be crossing the road you’re turning into from your right. Federal research has found drivers in slip lanes tend to turn 3 to 5 mph faster than at a standard right turn, and many roll through without fully stopping.4FHWA. Chapter 7: Intersections
Signaling and Turn Position
Turning your signal on before a three-way intersection is a legal requirement, not a courtesy. Most states require you to signal continuously for the last 100 to 200 feet before you turn. The exact distance varies by state, and some require more at higher speeds. Either way, the point is to give other drivers time to react before you slow and commit.
Lane position matters as much as the blinker. Turning right at a T-intersection, stay close to the right curb. Turning left, position near the center line. That second visual cue tells other drivers what you’re planning if they miss the signal. Swinging wide, like drifting left before a right turn, is a common cause of sideswipe crashes at three-way junctions.
Pedestrians and the Unmarked Crosswalk
Something most drivers don’t know: in nearly every jurisdiction, a legal crosswalk exists at every intersection whether or not it’s painted. The Uniform Vehicle Code defines a crosswalk as the extension of the sidewalk or shoulder across the intersection, marked or not.5FHWA. Safety Effects of Marked versus Unmarked Crosswalks at Uncontrolled Locations So if a sidewalk runs along one road at a three-way intersection, its invisible extension across the other road is a legal crosswalk.
You must yield to a pedestrian already crossing at that unmarked crosswalk, just as you would at a painted one. Pedestrians, in turn, cannot step out so suddenly that a driver has no chance to stop. That’s where most fault-sharing arguments start after a pedestrian collision. In 2022, more than 1,000 pedestrians were killed at unsignalized intersections alone.3FHWA. About Intersection Safety
U-Turns at T-Intersections
A T-intersection can look like an easy place to reverse direction. It isn’t. The general rule across states is that a U-turn is legal only if you can make it safely and without interfering with other traffic. The driver on the stem may pull out just as you swing through your U-turn on the through road, and neither of you expects the other.
Some jurisdictions prohibit U-turns at certain intersections, on curves, or near the crest of a hill where visibility drops below about 500 feet. Others leave it to a case-by-case judgment of reasonableness. If your U-turn causes a crash, the attempt itself weighs against you in any fault determination. Violating a U-turn statute can also establish negligence as a matter of law, cutting short the usual debate over who was being reasonable.
Emergency Vehicles
Every default rule above is suspended the moment an emergency vehicle approaches with active sirens and lights. You yield immediately, pull as far right as you can, and stop until it passes. If you’re mid-turn on a T-intersection stem and can’t pull right without blocking the junction, stop parallel to traffic flow and let the emergency driver pick a path around you. Watch for a second or third vehicle following close behind.
How Fault Is Decided After a Three-Way Intersection Crash
If a collision happens, the question of who pays comes down to fault, and a few pieces of evidence drive the answer.
- The police report. The responding officer documents the scene, takes witness statements, sketches a diagram, and often notes citations. It isn’t always admissible in court, but it’s usually the most influential document in an insurance investigation.
- Traffic citations. Running a stop sign, failing to yield, or making an illegal turn is strong evidence of negligence. Both adjusters and juries treat a citation as a near-automatic indicator of fault.
- Signal use and lane position. Whether your blinker was on and whether you were in the correct lane shapes the story of whether others could have anticipated your move.
- Physical evidence. Skid marks, damage patterns, and any traffic camera footage show speed, direction of impact, and whether anyone braked.
Most states use comparative negligence, meaning fault can be split between drivers as a percentage. In many states you can still recover damages if you were partly at fault, but only if your share stays below 50 or 51 percent depending on the state. A smaller group of states follow pure comparative negligence, allowing recovery even at 99 percent fault with the award reduced accordingly. A handful still apply contributory negligence, where being even 1 percent at fault bars recovery entirely. Which system your state uses matters a great deal if, say, you pulled out from a T-intersection stem and were struck by a speeding through-road driver.
Reporting the Accident
After any intersection collision, most states require you to notify police or your state DMV if property damage exceeds a set dollar threshold. The threshold ranges from as low as $250 to as high as $3,000 depending on the state, with most falling in the $1,000 to $2,000 range. Any crash involving an injury must be reported regardless of the damage amount. Failing to report can trigger separate penalties and can undercut your insurance claim later.