A driver who runs a red light or stops sign is presumed to be negligent in most cases, since traffic signals establish right-of-way. That means the violating driver often bears liability, but there are plenty of exceptions. The central question to answer is: what happened at the intersection?
Traffic signals establish who may proceed and who must wait. When a driver ignores a signal, vehicles can collide before anyone has time to react. In the confusion that follows, both drivers may sincerely believe they had the green light, making that dispute central to an injury claim.
These crashes can cause severe injuries, especially when one vehicle strikes the side of another. Victims may have trouble proving negligence because clear evidence of these accidents may not be available for long. Camera recordings can be overwritten, roadway marks can fade, and witnesses can become harder to reach. That is why preserving evidence early is critically important.
What Are the Most Common Ways People Fail to Obey Traffic Signals?
Most traffic signal violations begin with an ordinary decision made at an intersection. A driver continues forward after the light changes, drives slowly without stopping, or treats a flashing signal as permission to proceed. Each choice can put the driver into harm’s way.
Some of the most common ways people fail to obey traffic signals include:
- Running a red light: A driver crosses into the intersection after the signal turns red. This is not the same as lawfully entering the intersection before the light turns red and remaining there long enough to clear the crossing.
- Failing to stop at a stop sign: The vehicle slows while the driver checks for traffic but never comes to a complete stop. You are still required to stop if the intersection is empty.
- Disregarding a flashing signal: Drivers are required to come to a complete stop at a flashing red light. You can proceed with caution at a flashing yellow light. Treating either signal like a green light can create an unexpected conflict for other drivers.
- Misjudging a yellow light: The driver expects to enter before the signal changes but reaches the intersection after the light turns red. This may or may not be a violation, depending on when the driver entered the intersection.
After a crash, a witness may remember seeing a red light without having seen the other vehicle involved in the crash. The color of the light upon entry often matters more than the color after impact.
Do You Know the Yellow Light, Turns on Red, and Other Signal-Related Rules?
When the light is yellow, you can proceed with caution. Even though you are allowed to turn, you still have a duty to yield. Your position and intended direction should inform how you respond to the yellow light.
Responding to a Yellow Light
A driver already lawfully inside the intersection should continue through and clear it safely. Stopping there could block traffic, creating a higher risk of a crash. A driver who is still approaching should stop when there is enough room to do so safely, although rules for entering during yellow vary.
That decision can be more difficult for a large truck, which has a longer stopping distance and more time to clear the intersection. A light may change when the truck is too close to stop safely but still too far away to pass through before the light is red. When trucks are in this “dilemma zone”, sudden braking may create more danger than continuing forward.
Turning on Red
If you are at an intersection where you can turn right on a red light, you must come to a complete stop before doing so, even when the road appears empty. You may proceed only after yielding to pedestrians and approaching traffic that has the right of way. Local rules vary, and a posted prohibition requires the driver to wait for the signal to change before turning.
Yielding During Other Turns
A steady green light does not always give a driver immediate permission to turn left. The driver must first wait for approaching traffic and allow anyone already in the intersection to finish crossing. Drivers turning in either direction must also yield to pedestrians who have the right of way.
Sometimes drivers may have permission to proceed but turn before it is safe. In these situations, the signal violation, the unsafe turn, or both may have contributed to the crash.
Are Red Light Runners Always Liable If a Crash Occurs?
No. Running a red light is strong evidence that a driver acted negligently, but the violation must have contributed to the crash and injuries. A driver who enters an intersection with a red light and strikes traffic crossing on green presents a much clearer case than one involving conflicting signals or unsafe actions by both drivers.
The other driver’s conduct matters only if it helped cause the collision. A malfunctioning signal can also complicate what initially appears to be an obvious violation. However, these circumstances do not excuse the driver who drove through a red light.
Why Signal Violations Often Cause Rear-End and T-Bone Crashes
Signal violations often cause rear-end and T-bone crashes because drivers make conflicting decisions within a few seconds. One driver may stop while another expects traffic to continue, or a vehicle may enter an intersection across moving traffic.
Rear-End Collisions
A rear-end collision may happen when the front driver stops for a changing light, but the following driver expects that vehicle to continue. The driver behind may be following too closely or moving too quickly to stop in time.
Stopping suddenly does not automatically make the front driver liable. The reason for the stop, the available distance, and the following driver’s response all matter.
T-Bone Collisions
A T-bone crash usually occurs when a vehicle enters against the signal and crosses another vehicle’s path. The approaching driver may have only moments to recognize the danger before striking the other vehicle’s side.
These impacts can cause particularly severe injuries because a vehicle’s side offers less space to absorb the force than its front or rear. Actual harm still depends on speed, impact angle, vehicle design, and where each person was seated.
The damage can help show how the vehicles collided, but it may not reveal which signal each driver faced. That missing piece often becomes the central dispute.
How Traffic Camera Footage Can Support a Car Accident Injury Claim
Traffic camera footage can replace two conflicting accounts with a clear view of what happened. The recording may come from a traffic camera, a nearby business, or a dashcam in an involved or passing vehicle. The recording may show when each vehicle entered the intersection, where it traveled, and how much time remained before impact.
That footage may not remain available for long because many systems automatically overwrite older recordings. Sending a preservation request can be a critical step for victims who are filing claims. These requests ask the person, business, or agency controlling the footage to keep it, although obtaining a copy may require legal action.
The “He Said, She Said” Problem at Intersections Without Cameras
When there is no video evidence of a crash, insurers and attorneys must sort through two accounts of the collision. Both drivers may sincerely remember having permission to proceed.
Skid marks can show where braking began, while vehicle damage can help prove how the collision occurred. An independent witness may recall which vehicle entered the intersection first, or the color of the light. If the physical evidence does not fit either account, signal timing or maintenance records may explain why the accident happened.
Can a Malfunctioning Traffic Signal Affect Liability?
Yes. A broken or incorrectly timed signal can affect liability because drivers may have received conflicting or unclear instructions. Both drivers may have had green lights, or one signal may remain dark while traffic continues through the intersection.
The entity that maintained the traffic signal may share liability if the entity knew, or should have known, about the danger and failed to correct it or warn drivers. Drivers must respond cautiously when a signal is clearly malfunctioning. Failure to use caution could make them partially liable. Maintenance reports, earlier complaints, and timing records can reveal whether the problem was sudden or had been left unresolved.
Evidence Unique to a Traffic Signal Violation Claim
Vehicle damage may show how the cars collided, but it cannot reveal which driver had permission to enter the intersection. Your attorney may need additional evidence to establish liability, such as:
- Signal timing logs: These records show the programmed duration of each light phase, which can confirm whether a driver had a realistic amount of time to stop or whether the yellow phase was unusually short.
- Maintenance and inspection records: A history of reported problems or delayed repairs at that intersection can support an argument that the signal itself contributed to the crash.
- Physical evidence at the scene: Skid marks, the final resting position of the vehicles, and the pattern of damage can all corroborate or contradict drivers’ accounts of the accident.
- Statements from witnesses: Statements from drivers and any nearby witnesses shortly after the collision tend to carry more weight than statements made weeks later. Memories can fade over time.
FAQs
Does a citation help prove a traffic signal violation?
Yes, a citation can support a traffic signal violation, but it does not conclusively establish civil liability. The police officer’s observations and the evidence supporting the citation may carry more weight than the ticket alone. Often, victims cannot use a police report in a courtroom.
Can a missing or damaged stop sign change who is liable?
Yes. A missing or damaged stop sign may change the fault analysis because an approaching driver may not have received proper notice to stop. Responsibility could extend to the party responsible for maintaining the sign if it knew about the hazard and failed to address it.
What if there is no traffic camera and only one witness?
One credible witness can still provide valuable evidence when an intersection has no camera footage. What matters is where the witness stood, what they could see, and whether their account remains consistent. Physical evidence may provide further support for that account.
Am I at fault for being rear-ended after braking at a yellow light?
Braking for a yellow light does not automatically make the front driver responsible for a rear-end collision. Fault depends on whether the stop was reasonable and whether the following driver maintained a safe following distance. An abrupt stop may be more heavily scrutinized, especially when the driver had already entered the intersection.
Can a pedestrian or cyclist file a traffic signal violation claim?
Yes. A pedestrian or cyclist who was struck by a driver who disobeyed a traffic signal may file a claim for the resulting injuries and losses. The evidence must connect the violation to the collision, and the injured person’s own actions may also affect how fault is divided.
