The only error assigned in defendants’ appeal was the denial of their motion for judgment of nonsuit, and the only ground upon which it was argued that this motion should have been sustained was that on plaintiff’s testimony the injury to his automobile proximately resulted from his own contributory negligence.
While contributory negligence is an affirmative defense and within the rule that ordinarily nonsuit will not be allowed in favor of the party upon whom rests the burden of proof (Sims v. Lindsay, 122 N.C. 678, 30 S.E. 19), the principle is well settled that when the plaintiff’s own testimony establishes contributory negligence as a matter of law nonsuit should be allowed. Elder v. R. R., 194 N.C. 617, 140 S.E. 298; Hampton v. Hawkins, 219 N.C. 205, 13 S.E. 2d 227; Bus Co. v. Products Co., 229 N.C. 352, 49 S.E. 2d 623; Brown v. Bus Lines, 230 N.C. 493, 53 S.E. 2d 539; Cox v. Lee, 230 N.C. 155, 52 S.E. 2d 355; Fawley v. Bobo, ante, 203, 56 S.E. 2d 419. But it has been frequently declared by this Court *422tbat nonsuit on the ground of contributory negligence should be allowed only when the plaintiff’s evidence so clearly establishes such negligence that no other reasonable inference can be drawn therefrom. Bailey v. Michael, ante, 404; Dawson v. Transportation Co., 230 N.C. 36, 51 S.E. 2d 921; Winfield v. Smith, 230 N.C. 392, 53 S.E. 2d 251; Hobbs v. Drewer, 226 N.C. 146, 37 S.E. 2d 121; Cummins v. Fruit Co., 225 N.C. 625, 36 S.E. 2d 11; Cole v. Koonce, 214 N.C. 188, 198 S.E. 637. “It is only when plaintiff proves himself out of court that nonsuit may be entered on the issue of contributory negligence.” Barlow v. Bus Lines, 229 N.C. 382, 49 S.E. 2d 793.
In order to determine the propriety of the ruling below to which appellants have noted exception, we have examined the evidence shown by the record before us, and find the material facts according to plaintiff’s testimony were these: On 8 January, 1948, between 8 and 9 a.m. plaintiff was driving his automobile on the paved highway from Clemmons to Winston-Salem, and was following immediately behind defendants’ large truck loaded with lumber which was proceeding in the same direction around a curve in the road. The truck was being driven at about 20 miles per hour. Some 275 or 280 feet beyond the end of the curve was an unpaved side road leading to the left. The paved highway extended straight for 500 yards or more. There was no other traffic in sight. Reaching the end of this curve, with his view unobstructed, plaintiff sounded his horn and undertook to pass, traveling at the rate of 40 miles per hour. The driver of defendants’ truck, however, when 75 feet from the intersecting side road, without previous signal, drove the truck to the left into plaintiff’s lane of travel, in front of plaintiff’s automobile. The only signal given was by the truck driver’s hand just as plaintiff’s front wheels were even with the truck’s rear wheels. Plaintiff immediately applied his brakes and pulled to his left as far as he could without going down an embankment. Plaintiff testified the truck “just pulled right straight across the road in front of me and cut the corner of the intersection ... I either had to hit him or go down the embankment, so my right front wheel hit his rear wheel.” The collision occurred about where the side road enters the highway. Tire marks of plaintiff’s automobile on the pavement were visible for a distance of 78 feet back from the place of collision. Plaintiff’s automobile was injured. The truck was unharmed.
Defendants contend that plaintiff violated G.S. 20-150 (c) by attempting to pass a vehicle proceeding in the same direction at an intersection, and that the violation of this statute constituted negligence barring recovery, citing Cole v. Lumber Co., 230 N.C. 616, 55 S.E. 2d 86. However, in that case, as the basis for the decision affirming the nonsuit, it was said the collision “occurred when the automobile attempted to *423overtake and pass the truck at the intersection of a side road into which, the truck was turning.” Here the plaintiff, after signaling his intention so to do, had turned his automobile into the left traffic lane for the purpose of passing when he was 275 feet from the side road, and was driving at a speed twice that of the truck. From his point of view the factors of comparative speed and distance were such as to afford reasonable ground for the assumption that he could pass in safety before the truck reached the intersection, and the inference is permissible that but for the unexpected action of the driver of the truck in suddenly turning to the left in front of plaintiff's automobile 75 feet from the intersection, the collision would not have occurred. Williams v. Express Lines, 198 N.C. 193, 151 S.E. 197.
What is the proximate cause of an injury is ordinarily a question for the jury. It is to be determined as a fact from the attendant circumstances. Conley v. Pearce-Young-Angel Co., 224 N.C. 211, 29 S.E. 2d 740; Nichols v. Goldston, 228 N.C. 514, 46 S.E. 2d 320. Conflicting inferences of causation arising from the evidence carry the case to the jury.
We conclude that plaintiff’s evidence was sufficient to withstand a motion to nonsuit, and that defendants’ motion was properly denied.
In the trial we find
No error.