delivered the Opinion of the Court.
Following an automobile-motor bike accident, the automobile passenger sued the minor motorcyclist and his parents for her personal injuries and the automobile driver sued in a separate action for damages to his car. Two judgments were entered in the district court of McCone county following a consolidated nonjury trial: (1) Judgment for the passenger against all defendants. (2) Judgment against the driver -in favor of all defendants. The parents of the minor motorcyclist appeal from the first judgment and the driver cross appeals from the second judgment.
*481On July 28, 1966, at about 4:00 p.m. Clayton Ahrens, a 12 year old, was driving a Honda motor bike south on Montana Route 12 in McCone County. Vernon Sedlacek was driving a Cadillac, in which his wife Signe was a passenger, in the same direction behind the motor bike.
As the Cadillac approached a point on the highway about 600 feet before reaching the accident scene, the Cadillac slowed from about 70 miles per hour to about 60 miles per hour and then picked up speed as it prepared to pass the motor bike.
Clayton Ahrens did not signal his intent to turn left and Vernon Sedlacek did not sound his horn until he was in the act of passing.
As Clayton Ahrens was making his left turn, Vernon Sedlacek applied the brakes and pulled ■ left on to the shoulder of the highway causing the Cadillac to roll. It came to rest on its top with the front end on the pavement and the rear end half in the left borrow pit. It appeared from marks on the Cadillac that the motor bike had collided with the right rear fender of the car.
The motor bike was owned by Clayton Ahrens’ father who had purchased it ten days before the accident. Clayton was using it on Montana Route 12 without the knowledge of his parents, Edward and Dorothy Ahrens, and against their instructions that he not go out upon the highway when using the motor bike.
Signe Sedlacek received personal injuries in the accident. The Cadillac was extensively damaged. Clayton Ahrens received only superficial injuries and Vernon Sedlacek was not injured.
Signe Sedlacek filed a personal injury action against Clayton Ahrens and his parents. Vernon Sedlacek filed an action to recover damages to his Cadillac. Both actions were filed in the district court of McCone County and consolidated for trial.
Judge L. C. Gfulbrandson tried the case without a jury. He entered findings of fact and conclusions of law: (1) that Clay*482ton Ahrens was negligent in making a left turn off the highway without signaling; (2) Yernon Sedlacek was eontributorily negligent in driving at a speed greater than was reasonable under the existing conditions and in failing to sound his horn prior to passing; (3) that Edward Ahrens was liable for the injuries suffered by Signe Sedlacek by providing a motor vehicle to Clayton Ahrens who was a person forbidden by statute to operate a motor vehicle because of his age; and, (4) that Signe Sedlacek suffered $4,800 damages by reason of her injuries.
Judgment was entered in favor of Signe Sedlacek against Clayton Ahrens and his parents for $4,800, plus costs. A separate judgment was entered in favor of all defendants against Yernon Sedlacek denying damages to the Cadillac.
Edward and Dorothy Ahrens, Clayton’s parents, appeal from Signe Sedlacek’s $4,800 judgment against them; Clayton Ahrens does not appeal from this judgment. Yernon Sedlacek cross-appeals from the judgment denying him recovery for damages to the Cadillac.
Clayton’s parents contend that neither is liable for the injuries to Signe Sedlacek under the trial court’s findings and conclusions.
At the outset, we note there are no findings nor conclusions of the district court that support any liability on the part of Dorothy Ahrens. The district court so provided in the concluding paragraph of its findings:
“WHEREFORE, let Judgment be entered in favor of the plaintiff, Signe Sedlacek, against the defendants, Clayton E. Ahrens and Edward A. Ahrens, in the sum of $4,800 and her costs.”
The judgment was inadvertently entered against all defendants. The name of Dorothy Ahrens is ordered stricken from the judgment to conform to the findings and conclusions.
Two statutes of Montana’s Motor Yehicle Code are relevant to a discussion of Edward Ahrens’ liability:
*483Section 31-156, R.C.M. 1947, provides:
“(1) No person shall cause or knowingly permit his child or ward under the age of eighteen (18) years to drive a motor vehicle upon any highway when such minor is- not authorized hereunder or in violation of any provisions of this act.” Section 31-127, R.C.M. 1947, provided at the time of the accident:
“The board shall not issue any license hereunder:
“(1) To any person, as an operator, who is under the age of sixteen (16) years, with these exceptions:
“(a) * * *■
“(b) the board may issue a restricted license as hereinafter provided to any person who is at least thirteen (13) years of age # *
Edward Ahrens contends that he is not liable because (1) he did not knowingly permit his son Clayton to drive the motor bike upon the highway in violation of section 31-156, and (2) the licensing statute does not forbid a minor below licensing age to drive a motor bike on private property.
Edward’s contentions miss the point. The basis of his liability is entrustment of the motor bike to a person not qualified to operate it on a public highway. Liability is not predicated on knowingly permitting Clayton to drive the motor bike on the highway in violation of section 31-156. The relevant basis of liability was expressed in this language by the district court:
“The defendant, Edward Ahrens, by providing a motor vehicle to Clayton Ahrens who was a person forbidden by statute to operate a motor vehicle because of his age, is liable for injuries caused to the plaintiff, Signe Sedlacek, by the negligent operation of the motor bike by Clayton Ahrens.”
Licensing statutes such as section 31-127, R.C.M. 1947, prohibiting the issuance of an operator’s license to a minor below a prescribed age are enacted under a state’s police powers in the interests of public safety. One of the objects of such statutes is to protect users of the highways from inexperienced *484and immature drivers. Charbonneau v. MacRury, 84 N.H. 501, 153 A. 457, 73 A.L.R. 1266. Such statutes are legislative declarations that minors under licensing age are incompetent drivers and do not possess sufficient care and judgment to operate motor vehicles on the public highways without endangering the lives and limbs of others. Schultz v. Morrison, 91 Misc.Rep. 248, 154 N.Y.S. 257, aff’d, 172 App.Div. 940, 156 N.Y.S. 1144; 7 Am.Jur.2d, Automobiles and Highway Traffic § 107.
The fact that such a minor deviates from the consent given and exceeds its limitations will not relieve the provider from liability. 8 Am.Jur.2d, Automobiles and Highway Traffic § 575; Shrout v. Rinker, 148 Kan. 820, 84 P.2d 974; Strout v. Polakewich, 139 Me. 134, 27 A.2d 911. Liability is not bottomed on agency or imputed negligence where the scope of consent or authority may play a significant role. Respondeat superior and the family purpose doctrine are alien considerations. The act of the provider himself is the basis of liability— placing an unlicensable minor in possession of an instrumentality which in his immature and incompetent hands becomes dangerous to other motorists the licensing statute is designed to protect.
Counsel for defendants have cited three cases under similar facts where other courts have held the parent is not liable. Fitiles v. Umlah, 322 Mass. 325, 77 N.E.2d 212; Prewitt v. Walker, 231 Miss. 860, 97 So.2d 514; Marron v. Helmecke, 100 Colo. 364, 67 P.2d 1034. All are distinguishable. Fitiles and Marrón involved an agency relationship of employer-employee with scope of employment and consent the controlling elements in regard to liability. Prewitt involved imputed negligence arising from the parents’ signatures on a minor’s application for a driver’s license.
We affirm Signe Sedlacek’s judgment against Edward Ahrens.
The thrust of the crossappeal is that Vernon Sedlacek could, not have been contributorily negligent because (1) the acci*485dent happened the way Sedlaeeks testified and not the way Clayton said it did; (2) in any event, neither excessive speed nor failure to sound the horn prior to passing proximately caused the accident.
The first point simply involves a conflict in the evidence. We have consistently held under such circumstances that this Court cannot substitute its weighing of the evidence for that of the trial court. When there is a conflict in the evidence, the findings of the trial court are presumed to be correct if supported by substantial credible evidence. City of Missoula v. Rose, 164 Mont. 90, 519 P.2d 146.
The second point involves causation. Vernon Sedlacek’s contention, as we understand it, is that Clayton Ahrens’ negligence was the sole proximate cause of the accident and that neither excessive speed nor failure to sound his horn prior to passing on the part of Vernon Sedlacek contributed to the cause of the accident.
Excessive speed by Sedlacek could have contributed as a proximate cause of the accident under the evidence. “But for” such excessive speed the Cadillac could have been stopped short of a collision, or at least short of the ditch. The same may be said of the horn. “But for” Sedlacek’s failure to sound his horn sufficiently in advance of passing, Clayton would have been warned of the overtaking Cadillac iu time to avoid turning in its path. The “but for” test iu determining proximate cause has been approved in Montana. Sztaba v. Great Northern Ry., 147 Mont. 185, 411 P.2d 379.
Haney v. Mutual Creamery Co., 67 Mont. 278, 215 P. 656 does not support Sedlacek here. Haney simply held that under the evidence of plaintiff, he was not contributorily negligent as a matter of law and the question should be submitted to the jury.
The judgments of the district court, as modified to eliminate Dorothy Ahrens, are affirmed.
*486MR, CHIEF JUSTICE JAMES T. HARRISON and MR. JUSTICES JOHN C. HARRISON and DALY, concur.