A car drifts into your lane with no signal and you sideswipe it: how New York sorts out fault

Attorney Answer

Fault in New York is not awarded to one driver and taken from the other. It is apportioned — a share to the driver who moved across a lane line without signalling, and a share, if any, to the driver who had time and room to react and did not. Your own description supplies the facts that decide it: a gradual movement over three to four seconds, at 5 to 9 mph, by a vehicle already half a length ahead.

Two duties are in tension in a merge collision, and both are real. A driver moving from one lane into another has to make sure the movement can be made safely and has to signal the intention to do it; failing to signal is a violation in its own right and is evidence of negligence, though it is not automatically the whole answer. The driver who is behind or alongside carries a duty of their own. Vehicle and Traffic Law § 1129(a) states it: "The driver of a motor vehicle shall not follow another vehicle more closely than is reasonable and prudent, having due regard for the speed of such vehicles and the traffic upon and the condition of the highway." Adjusters and courts weigh those duties against each other on the particular facts rather than applying a rule that the merging driver always loses.

The details you have given are the ones that matter. Three to four seconds of gradual movement is a long time in a collision analysis, and it cuts both ways: it is long enough to show that the other vehicle's path was established and observable, and long enough that the other side will argue you had an opportunity to slow or sound the horn. The other vehicle being already half a length ahead of yours is significant, because it bears on who had the lane and on whose sightlines the movement crossed. And at 5 to 9 mph the physical evidence is subtle — light paint transfer, a shallow scrape angle — so photographs taken before repair carry more weight than they would in a heavy impact.

What a shared-fault finding means for what anyone recovers depends on facts this page does not have, including whether anyone was injured, and in New York it can also depend on when a lawsuit is commenced rather than on when the collision happened. That is not a detail to guess at, and it is the question to put to a New York attorney with your actual facts in front of them.

What you can do

1. Photograph both vehicles before any repair, close up on the paint transfer and wide enough to show where along each vehicle's length the damage sits.

2. Write down now, while it is fresh, the lane positions, the speeds, the gap, the three-to-four-second sequence and where each vehicle came to rest.

3. Save any dashcam file in its original format and back it up; look for business, traffic or transit cameras covering that stretch and ask about them quickly, because most systems overwrite within days.

4. Report the collision to your own insurer promptly and give the same account you wrote down.

5. Get the police accident report if one was made, and note anything in it that does not match what you observed.

6. Keep every medical record and bill if you or anyone in your vehicle was treated, even for something that seems minor.

7. Have a New York attorney review the evidence before you accept any carrier's apportionment as final — a liability decision by an insurer is a business decision, not a judgment.

⏱ Time limits apply. CPLR 214 sets three years for "an action to recover damages for a personal injury except as provided in sections 214-b, 214-c, 214-i and 215," and three years for an action to recover damages for an injury to property, measured from the date of the collision. Far shorter periods apply where a public corporation is involved — General Municipal Law § 50-e(1)(a) requires a notice of claim within ninety days after the claim arises and § 50-i(1)(c) requires the action to be commenced within one year and ninety days. A court can extend the time to serve that notice in some circumstances under General Municipal Law § 50-e(5), so a missed ninety days is not automatically the end of a claim. Which period is yours depends on your facts, and no date is calculated here. Have a New York attorney confirm it.