The opinion of the court was delivered by: Richard J. Holwell,District Judge:
MEMORANDUM OPINION AND ORDER
Plaintiff Asaf Ben Oz ("Oz") brought this personal injury action arising out of a rear-end collision allegedly caused by the negligence of Defendant Harry Lorowitz ("Lorowitz"). Oz has moved for partial summary judgment on the issue of liability. Lorowitz opposes that motion and has cross-moved for summary judgment. For the following reasons, Oz's motion for partial summary judgment is GRANTED and Lorowitz's motion for summary judgment is DENIED.
On Sunday, January 11, 2009, at some time between 12:00 and 1:00 p.m., Lorowitz left his sister's apartment at East Fortieth Street and Second Avenue in Manhattan, got into his 2005 Hyundai, and began driving south on Second Avenue. (Kirsch Dec. Ex. D at 1, 4.) Lorowitz was headed to pick up his nieces at Sunday school on East Fourteenth Street between First and Second Avenue. (Id. at 4.) Traffic was light and the road was dry. (Id. at 6, 8; Ex. E at 1.) As Lorowitz approached the intersection of East Twentieth Street and Second Avenue, he was travelling in the left-hand lane at approximately ten miles-per-hour. (Ex. D at 6, 12.) Some time before Lorowitz reached the intersection, the traffic light turned red at least in the far left lane and Oz had stopped his Ford Explorer in that lane. (Id. at 7; Ex. E at 1.) Seeing Oz's vehicle ahead of him, Lorowitz attempted to shift into the lane immediately to the right when "[a]ll of a sudden, two lanes over, a cab came speeding along and then shifted into the" lane into which Lorowitz intended to turn. (Id. at 6-7.) Lorowitz was "trying to maneuver and "avoid the cab that was speeding along," but, in returning to the far left lane, he collided with the right rear of Oz's vehicle. (Id. Ex. D at 7; Ex. A at 1.) According to the police report, Lorowitz stated "that he was trying to go around [Oz's vehicle] when another vehicle blocked him from changing lanes. Upon coming back into [the left lane], he struck" Oz's vehicle." (Id.)
This collision caused damage to Lorowitz's vehicle and, allegedly, significant injury to Oz, including herniated disks, nerve damage, neck pain and spasms, and severe back pain. (Id. Ex. D at 8.) As a result of these injuries, Oz has required steroid injections and extensive diagnostic testing and has experienced difficulty sleeping, engaging in physical activity, and working. (Compl. ¶ 17.)
Oz filed this action on June 16, 2009. Lorowitz answered on July 6, 2009. Both Oz and Lorowitz were deposed on October 30, 2009. On the basis of those depositions and the police report of the accident, Oz moved  for partial summary judgment on the issue of liability. Lorowitz opposed that motion and cross-moved  for summary judgment. The action was reassigned  to this Court on September 3, 2010.
Summary judgment is appropriate "if the pleadings, the discovery and disclosure materials on file, and any affidavits show that there is no genuine issue as to any material fact and that the movant is entitled to judgment as a matter of law." Fed. R. Civ. P. 56(c). "In ruling on a motion for summary judgment, the district court is required to 'resolve all ambiguities, and credit all factual inferences that could rationally be drawn, in favor of the party opposing summary judgment.'" Kessler v. Westchester County Dep't of Soc. Serv., 461 F.3d 199, 206 (2d Cir. 2006) (quoting Cifra v. Gen. Elec. Co., 252 F.3d 205, 216 (2d Cir. 2001)). "[A]t the summary judgment stage the judge's function is not himself to weigh the evidence and determine the truth of the matter but to determine whether there is a genuine issue for trial." Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 249 (1986). "A dispute about a 'genuine issue' exists for summary judgment purposes where the evidence is such that a reasonable jury could decide in the non-movant's favor." Beyer v. County of Nassau, 524 F.3d 160, 163 (2d Cir. 2008). "Unless the nonmoving party offers some hard evidence showing that its version of the events is not wholly fanciful, summary judgment is granted to the moving party." McCarthy v. Dun & Bradstreet Corp., 482 F.3d 184, 202 (2d Cir. 2007) (quotation marks omitted).
New York law governs this diversity action. Bank of New York v. Amoco Oil Co.,
35 F.3d 643, 650 (2d Cir. 1994). "Under New York law, a rear-end collision with a stopped automobile establishes a prima facie case of negligence on the part of the operator of the moving vehicle and imposes a duty of explanation on the operator of that vehicle." DeJesus v. Rafael, No. 00-CV-5137, 2002 WL 31925501, at *2 (S.D.N.Y. Dec. 31, 2002) (citing Mascitti v. Greene, 673 N.Y.S.2d 206 (2d Dep't 1998) and Leal v. Wolff, 638 N.Y.S.2d 110 (2d Dep't 1996)); see also Guzman v. Schiavone Const. Co, 772 N.Y.S.2d 25, 26 (1st Dep't 2004); Bucceri v. Frazer, 746 N.Y.S.2d 185, 187 (2d Dep't 2002). "The operator of the moving vehicle is required to rebut the inference of negligence created by an unexplained rear-end collision because he or she is in the best position to explain whether the collision was due to a mechanical failure, a sudden stop of the vehicle ahead, an unavoidable skidding on a wet pavement, or some other reasonable cause." Leal,638 N.Y.S.2d at 111; see also Stringari v. Peerless Importers, Inc, 757 N.Y.S.2d 554, 555 (1st Dep't 2003). "If the operator of the moving vehicle cannot come forward with any evidence to rebut the inference of negligence, the plaintiff may properly be awarded judgment as a matter of law." Leal, 638 N.Y.S.2d at 111-12.
Since Oz alleges that Lorowitz rear-ended his vehicle while Oz was stopped at a red light, Oz has made out a prima facie case that Lorowitz was negligent and the burden shifts to Lorowitz to produce evidence supporting a non-negligent explanation. Invoking the so-called emergency doctrine, Lorowitz points to his deposition testimony that he collided with Oz's vehicle in the left lane only because he had to avoid a speeding cab swerving into the adjacent lane. The emergency "doctrine recognizes that when an actor is faced with a sudden and unexpected circumstance which leaves little or no time for thought, deliberation or consideration, or causes the actor to be reasonably so disturbed that the actor must make a speedy decision without weighing alternative courses of conduct, the actor may not be negligent if the actions taken are reasonable and prudent in the emergency context." Rivera v. New York City Transit Auth., 77 N.Y.2d 322, 327 (1991). "However, the emergency doctrine typically is inapplicable to routine rear-end traffic accidents." Johnson v. Philips, 690 N.Y.S.2d 545, 548 (1st Dep't 1999).And "[a] driver confronted with an emergency situation may still be found to be at fault for the resulting accident where his or her reaction is found to be unreasonable or where the prior tortious conduct of the driver contributed to bringing about the emergency." Mehring v. Cahill, 707 N.Y.S.2d 125, 127 (2d Dep't 2000).
Oz makes two responses to Lorowitz's invocation of the emergency doctrine. First, Oz contends that Lorowitz is barred from invoking the emergency doctrine because Lorowitz did not raise emergency as an affirmative defense in his answer. (Oz Reply at 2.) Oz cites two New York casesfor that proposition, Franco v. G. Michael Cab Corp., 898 N.Y.S.2d 186 (2d Dep't 2010), and Bello v. Transit Authority of New York City, 783 N.Y.S.2d 648 (2d Dep't 2004). But the Federal Rules of Civil Procedure, not the CPLR, govern pleading in a diversity action in federal court. Under Federal Rule 8(c), "[i]n responding to a pleading, a party must affirmatively state any avoidance or affirmative defense." Fed. R. Civ. P. 8(C)(1). "Generally," then, 'a failure to plead an affirmative defense results in a waiver.'" Nat'l Mkt. Share, Inc. v. Sterling Nat'l Bank, 392 F.3d 520, 526 (2d Cir. 2004) (quoting Travellers Int'l, A.G. v. Trans World Airlines, Inc., 41 F.3d 1570, 1580 (2d Cir. 1994)). However, "a district court may still entertain affirmative defenses at the summary judgment stage in the absence of undue prejudice to the plaintiff, bad faith or dilatory motive on the part of the defendant, futility, or undue delay of the proceedings." Saks v. Franklin Covey Co., 316 F.3d 337, 350 (2d Cir. 2003). "In such circumstances, a district court, may construe the motion for summary judgment as a motion to amend defendant's answer." Id. at 350-351. (quotation marks omitted).
Oz has not pointed to any prejudice from consideration of Lorowitz's emergency doctrine defense. Nor does it seem that Oz could show prejudice where he was on notice that Lorowitz intended to defend on the ground that the collision was unavoidable due to the swerving cab after Lorowitz offered that explanation at his deposition. Accordingly, the Court will consider Lorowitz's emergency doctrine defense. See Monex Fin. Serv. Ltd. v. Nova Info. Sys. Inc., 657 F .Supp. 2d 447, 457 (S.D.N.Y. 2009); Arias-Zeballos v. Tan, No. 06-CV-1268, 2008 WL 833225, at *4 n. 3 (S.D.N.Y. Mar. 28, 2008); Dessert Beauty, Inc. v. Fox, 617 F. Supp. 2d 185, 191 (S.D.N.Y. 2007). Accord Edwards v. New York City Transit Auth., 829 N.Y.S.2d 462, 463 (1st Dep't 2007) ("Even if there were some details unknown to plaintiff, the ...