Legal Disclaimer: This article provides general legal information only. Laws vary by jurisdiction, and individual circumstances differ substantially. Consult a licensed attorney in your state for advice specific to your situation.
The Duty to Change Position Safely
Every lane change and turn requires the driver to ensure the maneuver can be completed safely. Traffic laws impose specific requirements: signaling, yielding to traffic with the right-of-way, and maintaining proper lane position. Violation of these requirements constitutes strong evidence of negligence.
Lane change and turn violations are among the most common causes of traffic crashes. According to NHTSA analysis, improper lane changes contribute to approximately 9% of all crashes, while improper turns contribute to another significant percentage of intersection collisions.
Turn Violations
Left Turn Against Oncoming Traffic
Left turns require yielding to oncoming traffic. A driver who turns left into the path of an oncoming vehicle has violated this duty. The left-turning driver typically bears primary responsibility unless the oncoming vehicle was speeding substantially, ran a signal, or was otherwise negligent.
Left-turn collisions often result in T-bone impacts with the oncoming vehicle striking the turning vehicle’s side. These crashes cause serious injuries due to the limited protection offered by vehicle doors.
Right Turn Wide or Short
Right turns must be made from the rightmost lane into the rightmost lane (absent lane markings indicating otherwise). A “wide” right turn that swings into adjacent lanes violates this requirement. A “short” right turn that cuts the corner may cross into oncoming traffic.
Turn From Wrong Lane
Turns must be made from appropriate lanes. A left turn from the center lane when a dedicated left-turn lane exists violates traffic laws. This violation creates crash risk with vehicles properly positioned in the turn lane.
Turn Against Signal
Turning against a red arrow or “no turn” sign is a clear violation. These signals exist because turning at that location is inherently dangerous (limited sight lines, pedestrian crossings, etc.).
U-Turn Violations
U-turns are prohibited in many locations: near intersections, where visibility is limited, in business districts, and where signs prohibit them. An illegal U-turn that causes a crash establishes breach through negligence per se.
Lane Change Violations
Failure to Signal
Most states require signals before lane changes. The signal must be activated far enough in advance (typically 100 feet or more) to give following traffic notice of the intended maneuver.
Failure to signal is a traffic violation. While a momentary signal failure might seem minor, the signal requirement exists precisely to prevent the crashes that occur when other drivers are surprised by lane changes.
Unsafe Lane Change
Beyond signaling, drivers must ensure the lane change can be made safely. A driver who signals but changes lanes into a vehicle already occupying that space has made an unsafe lane change.
The standard is whether a reasonable driver would have concluded the lane change was safe under the circumstances.
Cutting Off Other Vehicles
A lane change that forces another vehicle to brake or swerve demonstrates the maneuver was unsafe. “Cutting off” another driver establishes the lane-changing driver failed to ensure adequate clearance.
Lane Changes in Intersections
Many states prohibit lane changes within intersections. The complexity of intersection traffic makes lane changes there particularly dangerous. A lane change in an intersection that causes a crash violates this prohibition where applicable.
HOV Lane Violations
Crossing double lines to enter or exit HOV (carpool) lanes violates traffic laws. These restrictions exist because the lane configuration makes merging dangerous at unauthorized points.
Negligence Per Se Analysis
Turn and lane change violations satisfy negligence per se requirements. The violated statutes exist to protect other road users from collisions caused by unexpected maneuvers. Any driver or pedestrian harmed by the violation is within the protected class.
With breach established through negligence per se, the plaintiff must still prove the violation caused the crash and the crash caused damages.
Defensive Arguments
The Other Driver’s Negligence
Defendants argue the other driver’s negligence contributed to or caused the crash. A driver who rear-ends a turning vehicle might have been following too closely to stop. A driver struck during a lane change might have been in the blind spot due to their own improper positioning or speeding.
Sudden Emergency
If the lane change or turn resulted from a sudden emergency not of the driver’s making, the emergency doctrine may excuse the violation. A driver who swerved to avoid a child in the road cannot be held to the same standard as a driver making a routine lane change.
Comparative Fault
Even when the lane-changing or turning driver violated traffic laws, the other driver may share fault. Comparative fault analysis allocates responsibility based on each driver’s contribution to the crash.
Proving Turn and Lane Change Violations
Witness Testimony
Passengers and other drivers observe whether signals were used, whether the driver checked blind spots, and whether the maneuver was made safely.
Physical Evidence
Impact damage shows the angle and location of collision. A sideswipe pattern indicates the vehicles were traveling parallel when contact occurred, suggesting a lane change collision. Front-to-side damage suggests a turn collision.
Dashcam and Surveillance Footage
Video evidence objectively shows whether signals were used and whether the maneuver was made safely. Trucking companies maintain forward-facing and side-facing cameras that may capture the incident.
Vehicle Data
Turn signal activation is sometimes recorded in vehicle data systems. EDR data may show steering inputs and timing relevant to lane change analysis.
Expert Reconstruction
Accident reconstructionists analyze physical evidence, vehicle specifications, and roadway geometry to determine what maneuvers occurred and whether they violated traffic laws.
Side-Impact Crash Severity
Turn and lane change collisions often result in side impacts. Vehicles provide substantially less protection from side impacts than from frontal impacts. The crumple zones designed into vehicle fronts do not exist on the sides, where the door is often mere inches from the occupant.
Side impact crashes cause a disproportionate share of serious injuries and fatalities relative to other crash types. This severity increases the stakes in turn and lane change litigation.
Commercial Vehicle Considerations
Large trucks have substantial blind spots where lane change collisions occur. Truck drivers have a heightened duty to check blind spots because of the severe consequences when large vehicles collide with smaller ones.
FMCSR requires commercial drivers to exercise additional care given the size differential between trucks and passenger vehicles. Failure to adequately check mirrors and blind spots before lane changes violates this duty.
Key Takeaways:
Turn and lane change violations create negligence per se liability when they cause crashes. Left turns require yielding to oncoming traffic; failure to yield places primary fault on the turning driver. Lane changes require signaling and ensuring adequate clearance. According to NHTSA analysis, improper lane changes contribute to approximately 9% of crashes. Side impact crashes cause disproportionate injuries due to limited vehicle side protection. Defendants may argue comparative fault, sudden emergency, or the other driver’s contributing negligence.
Sources:
- Lane change crash contribution: NHTSA crash causation and statistical analysis
- Signal distance requirements: Uniform Vehicle Code § 11-604 (signal at least 100 feet before)
- Side impact injury severity: IIHS vehicle safety research