¶1This is an action of tort in which the plaintiff seeks to recover for personal injuries and property damage arising out of the collision of motor vehicles. The answer is a *182general denial, contributory negligence and violation of law.
¶2At the trial, there was evidence tending to show the following:
¶3The accident occurred on November 15, 1963 at about 4:50 p.m. on Route C-l, near Revere Drive-In Theatre. Immediately prior to the time of the accident, traffic was heavy with three lanes of traffic travelling northerly at about 40-45 miles per hour. The weather was clear, and the road was dry.
¶4The accident involved four vehicles: The first vehicle was owned and operated by the defendant, George Murphy; the second vehicle was owned and operated by the plaintiff, Eleanor Schloesser; the third vehicle was owned and operated by the defendant, Robert Siebert; the fourth vehicle was owned and operated by the defendant, R. Virginia Leach. All four vehicles were traveling in line in the passing lane just prior to the accident.
¶5Just prior to the accident, the defendant Murphy brought his vehicle to a stop when the traffic in front of him stopped. The plaintiff, Schloesser, was 40-50 feet to the rear of the Murphy vehicle and traveling at a speed of 40-45 miles per hour when she realized that Murphy had stopped. She applied her brakes and stopped one to two feet from the rear of the Murphy vehicle. The defendant, Siebert, saw the Murphy vehicle slow down and stop and saw the Schloesser vehicle stop and 'applied *183his brakes; he was 35-40 feet from the rear of the Schloesser vehicle and traveling 40 to 45 miles per hour at the time when he applied his brakes. His vehicle struck the rear of the Schloesser vehicle. The defendant, Leach, saw the Siebert vehicle stop immediately in front of her as it hit the Schloesser vehicle; at the time she was traveling two to three car lengths to the rear of the Siebert vehicle.
¶6The plaintiff, Schloesser, felt a jolt at the time of impact and was thrown about; she then felt another “jerk from the rear”. The plaintiff, Schloesser, was injured.
¶7The vehicle owned by Schloesser was damaged in the amount of $209.00, all of the damage being to the front end of the vehicle.
¶8At the close of the trial, the defendant, Leach, made the following requests for rulings:
¶9(1) There is no evidence to warrant a finding for the plaintiff, as to the defendant, Virginia Leach.
¶10(2) There is evidence to warrant a finding for the defendant, Virginia Leach.
¶11(3) There is no evidence of negligence on the part of the defendant, Virginia Leach.
¶12The court denied the defendant requests 1 and 3 and allowed 2, as follows:
¶13Request No. 1 denied, for the reason that I find the evidence does warrant a finding for the plaintiff, as to the defendant, Virginia Leach.
¶14Bequest No. 2 granted, but I do not so in *184fact find because the weight of the evidence is otherwise.
¶15Request No. 3 denied, for the reason that I find there is evidence of negligence on the part of the defendant, Virginia Leach.
¶16The Court found the following facts:
¶17(1) The combined careless acts of the defendants, Richard E. Siebert and Virginia Leach, produced the collision, which was the natural, probable, and proximate result of the carelessness of each of the said defendants, causing the injuries and damages sustained by the plaintiff, Eleanor Schloesser.
¶18(2) The plaintiff, Eleanor Schloesser, was Hot guilty of contributory negligence.
¶19The case was1 originally before this Division on June 15,1966. At that time, it was remanded to the trial judge for amplification of his report and findings. Subsequently, the trial judge filed an “Amendment to [His] Draft Report” and “Special Findings of Pact”.
¶20When the case next came before this Division, the defendant, Virginia Leach, filed a motion “To Strike the Amendment to Draft Report”. The motion was assented to by the plaintiff and allowed by the Division.
¶21The “Special Findings of Fact” attached to the amendment were not stricken ¡and follow:
¶22(1) The defendant Leach’s vehicle struck the rear of the Siebert vehicle while *185it was in contact with the Schloesser vehicle.
¶23(2) Two to four seconds transpired between the first impact and the second impact.
¶24(3) The plaintiff Schloesser felt a jolt at the time of the first impact (the Siebert vehicle) and felt a jerk from the rear at the time of the second impact (the Leach vehicle) and was thrown about by -each impact.
¶25(4) The Schloesser vehicle was pushed forward by each impact.
¶26(5) The combined careless acts- of the defendants, Bichard E. Siebert and Virginia Leach, produced the collision, which was the natural, probable and proximate result of the carelessness of each of the said defendants, causing the injuries and damages sustained by the plaintiff, Eleanor Schloesser.
¶27(6) The plaintiff Schloesser was injured by each impact.
¶28(7) The plaintiff Eleanor Schloesser was not guilty of contributory negligence.
¶29Because the original report does not contain evidence in support of the Special Findings of Fact numbered 1, 2, 3 and 4, they are not considered in this opinion.
¶30The defendant contends that the denial of her requests 1 and 3 constitute error. We do not agree.
¶31*186We recognize the legal principle that the mere occurrence of a rear-end collision of vehicles on a highway is no evidence of negligence. Reardon v. Boston El. Ry., 247 Mass. 124-126
¶32However, the circumstances ¡of the collision may create a reasonable inference, based on common experience, that it would not have occurred if the operator of the colliding vehicle had been careful. Cousens v. Cummings, 332 Mass. 649
¶33In this case, the evidence goes far enough to show with reasonable probability that the collision between the Leach car and Siebert car occurred because—
¶34(a) The Leach car was traveling too closely behind the Siebert car immediately prior to the collision, or
¶35(b) The defendant Leach was inattentive to the operation of the Siebert car.
¶36In either event, the evidence would warrant a finding that the defendant Leach was negligent. Murphy v. NE Transp. Co., 273 Mass. 275
¶37In a situation like this an explanation is due if something other than negligence is the cause of the collision. Washburn v. R. F. Owens Co., 252 Mass. 47, 54 Moreover, the plaintiff was not required to exclude other possible causes for the collision such as a sudden failure of the brakes of the *187Leach motor vehicle. Young v. NY., NH & H R.R., 273 Mass. 567
¶38In support of her contention that her request #1 should have been allowed, the defendant Leach argues that there is no evidence in the report to show the required causal connection between her alleged negligence 'and the injuries suffered by the plaintiff. Again we disagree.
¶39The finding of the trial judge, “that the combined careless acts of the defendants, Siebert and Leach, produced the collision, which was the natural, probable and proximate result of the carelessness of each of the said defendants, causing the injuries and damages sustained by the plaintiff, Eleanor Schloesser”, was a finding that the defendants Siebert and Leach were concurrent tortfeasors.
¶40As such, it makes no difference that they did not act in concert or that their respective acts of negligence were somewhat separated in time. Nor does it make a difference that it is impossible to determine what portion of the injury was caused by each. If each contributed to the injury, that is enough to bind both. "Whether each contributed was a question for the trial judge. Corey v. Havener, 182 Mass. 250; M. P. S. Vol. 11, Martin & Hennessey, § 13. See also Feneff v. B & M RR., 196 Mass. 575, 581 wherein the Court said: “but whatever diversity of opinion may be elsewhere, the law must be considered as settled, that if two or more wrongdoers negligently contributed to the *188personal injury of another by their several acts, which operate concurrently, so that in effect the damages suffered are rendered inseparable, they are jointly and severally liable”.
¶41The defendant Leach relies on the case Cormier v. Bodkin, 300 Mass. 357, which is easily distinguished from the ease at hand. In the Bodkincase, there no negligence was found. The court did point out that if one of the defendants were negligent, she could be held only for the injuries she caused. If there are not concurrent or joint tortfeasors, the joint and several liability obviously cannot exist. There is one other distinction and that is that in the Bodkincase, there were several deaths as well as personal injuries involved. Actions for death, because of the terms of the death statute, [G.L. c. 229, §5] must be brought severally. Although the wrong in such cases remains joint, because of the statute, the damages must be assessed severally with separate findings (or verdicts) and judgments. Brown v. Thayer, 212 Mass. 392
¶42There being no prejudicial error, the report is dismissed.