WATT, J.:
11 We granted certiorari in this matter to determine if facts relevant to the question of primary negligence are in dispute or whether uncontroverted facts result in conflicting inferences. We have carefully reviewed the merits of the summary judgment record in light of the heavy burden imposed on the moving party in a negligence action. Before a court may grant this definitive relief, it must clearly appear that the movant is entitled to judgment as a matter of law, viewing the proffered material in the light most favorable to the opposing party.3 Summary judgment is unwarranted where, as in this matter, relevant facts are in dispute or where reasonable persons exercising fair and impartial judgment could differ.4
T2 Drivers of motor vehicles have a duty to exercise due care in the operation of their vehicle.5 Ginger Merrill ("Merrill"), whom plaintiffs dismissed from this suit, drove the only vehicle that collided with the motorcycle. Although Kuehn had no direct contact with Patterson or Fargo, whether she operated her vehicle with due care when she abruptly swerved into the motoreycle's lane without a signal knowing Merrill was directly behind, is a question to be resolved by the fact finder.6 The Oklahoma Highway Patrol ("OHP") Investigator determined the collision was created by Kuchn's inattention and failure to stop. However, the record contains disputed key facts and differing expert opinions. This case requires a factual inquiry of the conflicting evidence which leads to the formation of different inferences. Because more than one conclusion can be reached, this matter must be resolved by a jury. Upon de novo review, we hold the trial court erred in granting summary judgment and reverse.
FACTUAL AND PROCEDURAL HISTORY
T3 On July 25, 2008, Jason Patterson died at the seene when the southbound motorcycle he was driving at highway speed impaled onto the front driver side windshield of Mer-vill's northbound vehicle after it erossed into Patterson's lane of traffic. Plaintiff, Fargo, a passenger on the motorcycle, was thrown from the motorcycle, receiving multiple injuries. Plaintiffs initially filed this action against Kuehn, Merrill and Angeline Sankey ("Sankey") for negligence in the operation of their respective vehicles, but later filed a dismissal without prejudice against Merrill and Sankey. Kuchn is the only remaining defendant in this matter.
T4 The three defendants were all separately traveling northbound in succession at highway speeds, on a rural two lane highway. Vehicle 1 was driven by Sankey who slowed and then stopped at an intersection waiting for oncoming traffic to clear, including the motorcycle, before making a left turn. Kuehn, the driver of vehicle 2, a "larger" truck, did not slow down or stop behind Sankey. Instead, Kuehn continued at highway speed and passed Sankey on the left, crossing the centerline into the oncoming traffic lane. Both Sankey and her passenger [1226]*1226describe Kuehn as "flying by" their truck and coming so close that they thought Kuehn was going to hit and take off their driver's side rear view mirror.
5 Merrill, in vehicle 3, was also driving at highway speed directly behind Kuehn. While Kuehn's larger truck remained in front of Merrill, blocking her view, Merrill was unable to see Sankey and thus, did not realize she was swiftly approaching a stopped vehicle. Without slowing or using a turn signal, Kuehn abruptly swerved left, at which time Merrill's view opened and she saw San-key's stationary smaller truck. Attempting to avoid a collision, Merrill followed Kuehn into the oncoming lane to avoid hitting San-key. Merrill could not see the rapidly approaching motorcycle, because Kuchn's "larger" truck blocked her view. When Kuehn swerved back into the northbound lane, Merrill became aware of the impending motorcycle and her efforts at evasive action failed. Merrill attempted to swerve back into her lane of traffic to avoid the motorcey-cle, but instead hit Sankey's left rear panel and then the motorcycle.
I 6 When interviewed by OHP, Merrill described Sankey's vehicle as a "smaller truck" and that Kuehn was driving a "large truck". Merrill told OHP and testified in her deposition that she saw Sankey's truck as they drove out of town, but did not see it again until right before the accident because it was hidden by Kuehn's larger truck. Merrill is certain that Kuehn did not brake or signal immediately before making a sudden swerve into the oncoming traffic lane to pass Sankey. A span of seconds passed from the time that Kuehn entered the oncoming traffic lane to pass Sankey and the collision between the motorcycle and Merrill.
T7 Three days after the accident, Kuehn explained to OHP she initially realized that Sankey was slowing, but as she got closer, she saw Sankey was stopped. Kuchn explained to OHP that if she had observed brake lights she would have stopped and that if she had seen a left turn signal, she would not have passed Sankey. However, she explained to OHP that she is not completely certain she did not see brake or turn signal lights on Sankey's truck. Kuehn said she passed Sankey because she did not know what Sankey was doing sitting in the middle of the north bound lane.
T8 Seconds after passing Sankey, Kuehn heard a loud boom, then pulled over and stopped. When she saw a collision had occurred, she backed her vehicle to the accident scene. Kuehn then walked over to Merrill sitting in her wrecked vehicle and apologized, stating Sankey had slammed on her brakes. Three years later in a deposition, Kuchn testified that she never saw the Sankey vehicle stop at the intersection and that Sankey's truck was actually moving when she passed it.
19 OHP collected data from Merrill's air bag module and the bulbs from the rear lights of the Sankey vehicle. Their analysis showed Merrill's brakes were activated prior to impact, with decelerating speeds ranging from 65 mph at five seconds prior to impact to 45 mph at one second prior to impact. OHP also determined from the physical evidence and testing that Sankey's left turn signal was activated at the time her vehicle was hit from behind.
10 OHP concluded the collision was created by the inattention and failure of Kuehn to reduce her speed for Sankey, and that Merrill was following too close behind Kuehn, not allowing enough distance to react to hazards in front of her. Even though Kuehn's vehicle did not physically collide with Sankey or with the motorcycle, OHP determined that Kuehn's actions were a direct cause of the accident. OHP recommended that charges of operating a motor vehicle at a speed greater than reasonable or proper for the conditions be filed against both Kuehn and Merrill.
SUMMARY JUDGMENT STANDARD
" 11 An order granting summary judgment in favor of Kuehn was filed on December 20, 2012. Plaintiffs appealed and the Court of Civil Appeals affirmed, finding at most (1) Kuehn's actions were a "condition", (2) it was not foreseeable that Merrill, who was following directly behind Kuehn, would follow into the oncoming traffic lane and hit the motorcycle injuring Patterson and Plaintiff Fargo [1227]*1227and (3) that Kuehn's actions were not the proximate cause of Plaintiffs' injuries and damages. Plaintiffs appealed, urging the resolution of proximate cause was a question of fact for a jury to decide. We granted certiorari on February 8, 2015.
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WATT, J.:
11 We granted certiorari in this matter to determine if facts relevant to the question of primary negligence are in dispute or whether uncontroverted facts result in conflicting inferences. We have carefully reviewed the merits of the summary judgment record in light of the heavy burden imposed on the moving party in a negligence action. Before a court may grant this definitive relief, it must clearly appear that the movant is entitled to judgment as a matter of law, viewing the proffered material in the light most favorable to the opposing party.3 Summary judgment is unwarranted where, as in this matter, relevant facts are in dispute or where reasonable persons exercising fair and impartial judgment could differ.4
T2 Drivers of motor vehicles have a duty to exercise due care in the operation of their vehicle.5 Ginger Merrill ("Merrill"), whom plaintiffs dismissed from this suit, drove the only vehicle that collided with the motorcycle. Although Kuehn had no direct contact with Patterson or Fargo, whether she operated her vehicle with due care when she abruptly swerved into the motoreycle's lane without a signal knowing Merrill was directly behind, is a question to be resolved by the fact finder.6 The Oklahoma Highway Patrol ("OHP") Investigator determined the collision was created by Kuchn's inattention and failure to stop. However, the record contains disputed key facts and differing expert opinions. This case requires a factual inquiry of the conflicting evidence which leads to the formation of different inferences. Because more than one conclusion can be reached, this matter must be resolved by a jury. Upon de novo review, we hold the trial court erred in granting summary judgment and reverse.
FACTUAL AND PROCEDURAL HISTORY
T3 On July 25, 2008, Jason Patterson died at the seene when the southbound motorcycle he was driving at highway speed impaled onto the front driver side windshield of Mer-vill's northbound vehicle after it erossed into Patterson's lane of traffic. Plaintiff, Fargo, a passenger on the motorcycle, was thrown from the motorcycle, receiving multiple injuries. Plaintiffs initially filed this action against Kuehn, Merrill and Angeline Sankey ("Sankey") for negligence in the operation of their respective vehicles, but later filed a dismissal without prejudice against Merrill and Sankey. Kuchn is the only remaining defendant in this matter.
T4 The three defendants were all separately traveling northbound in succession at highway speeds, on a rural two lane highway. Vehicle 1 was driven by Sankey who slowed and then stopped at an intersection waiting for oncoming traffic to clear, including the motorcycle, before making a left turn. Kuehn, the driver of vehicle 2, a "larger" truck, did not slow down or stop behind Sankey. Instead, Kuehn continued at highway speed and passed Sankey on the left, crossing the centerline into the oncoming traffic lane. Both Sankey and her passenger [1226]*1226describe Kuehn as "flying by" their truck and coming so close that they thought Kuehn was going to hit and take off their driver's side rear view mirror.
5 Merrill, in vehicle 3, was also driving at highway speed directly behind Kuehn. While Kuehn's larger truck remained in front of Merrill, blocking her view, Merrill was unable to see Sankey and thus, did not realize she was swiftly approaching a stopped vehicle. Without slowing or using a turn signal, Kuehn abruptly swerved left, at which time Merrill's view opened and she saw San-key's stationary smaller truck. Attempting to avoid a collision, Merrill followed Kuehn into the oncoming lane to avoid hitting San-key. Merrill could not see the rapidly approaching motorcycle, because Kuchn's "larger" truck blocked her view. When Kuehn swerved back into the northbound lane, Merrill became aware of the impending motorcycle and her efforts at evasive action failed. Merrill attempted to swerve back into her lane of traffic to avoid the motorcey-cle, but instead hit Sankey's left rear panel and then the motorcycle.
I 6 When interviewed by OHP, Merrill described Sankey's vehicle as a "smaller truck" and that Kuehn was driving a "large truck". Merrill told OHP and testified in her deposition that she saw Sankey's truck as they drove out of town, but did not see it again until right before the accident because it was hidden by Kuehn's larger truck. Merrill is certain that Kuehn did not brake or signal immediately before making a sudden swerve into the oncoming traffic lane to pass Sankey. A span of seconds passed from the time that Kuehn entered the oncoming traffic lane to pass Sankey and the collision between the motorcycle and Merrill.
T7 Three days after the accident, Kuehn explained to OHP she initially realized that Sankey was slowing, but as she got closer, she saw Sankey was stopped. Kuchn explained to OHP that if she had observed brake lights she would have stopped and that if she had seen a left turn signal, she would not have passed Sankey. However, she explained to OHP that she is not completely certain she did not see brake or turn signal lights on Sankey's truck. Kuehn said she passed Sankey because she did not know what Sankey was doing sitting in the middle of the north bound lane.
T8 Seconds after passing Sankey, Kuehn heard a loud boom, then pulled over and stopped. When she saw a collision had occurred, she backed her vehicle to the accident scene. Kuehn then walked over to Merrill sitting in her wrecked vehicle and apologized, stating Sankey had slammed on her brakes. Three years later in a deposition, Kuchn testified that she never saw the Sankey vehicle stop at the intersection and that Sankey's truck was actually moving when she passed it.
19 OHP collected data from Merrill's air bag module and the bulbs from the rear lights of the Sankey vehicle. Their analysis showed Merrill's brakes were activated prior to impact, with decelerating speeds ranging from 65 mph at five seconds prior to impact to 45 mph at one second prior to impact. OHP also determined from the physical evidence and testing that Sankey's left turn signal was activated at the time her vehicle was hit from behind.
10 OHP concluded the collision was created by the inattention and failure of Kuehn to reduce her speed for Sankey, and that Merrill was following too close behind Kuehn, not allowing enough distance to react to hazards in front of her. Even though Kuehn's vehicle did not physically collide with Sankey or with the motorcycle, OHP determined that Kuehn's actions were a direct cause of the accident. OHP recommended that charges of operating a motor vehicle at a speed greater than reasonable or proper for the conditions be filed against both Kuehn and Merrill.
SUMMARY JUDGMENT STANDARD
" 11 An order granting summary judgment in favor of Kuehn was filed on December 20, 2012. Plaintiffs appealed and the Court of Civil Appeals affirmed, finding at most (1) Kuehn's actions were a "condition", (2) it was not foreseeable that Merrill, who was following directly behind Kuehn, would follow into the oncoming traffic lane and hit the motorcycle injuring Patterson and Plaintiff Fargo [1227]*1227and (3) that Kuehn's actions were not the proximate cause of Plaintiffs' injuries and damages. Plaintiffs appealed, urging the resolution of proximate cause was a question of fact for a jury to decide. We granted certiorari on February 8, 2015.
{12 Summary judgments are disfavored and should only be granted when it is clear there are no disputed material fact issues.7 This Court has consistently held that summary judgment should be denied where there are controverted material facts or if reasonable minds could reach different conclusions from the undisputed material facts.8 The facts and inferences therefrom must be viewed in the light most favorable to the non moving party.9 Thus all inferences must be viewed most favorably to plaintiffs in this matter.
DISCUSSION OF NEGLIGENCE AND PROXIMATE CAUSE INVOLVING MULTI VEHICLE TORT ACTIONS
13 The three necessary elements to a finding of negligence are (1) a duty owed by the defendant to protect plaintiff from injury (2) failure to fulfill that duty and (8) injuries to plaintiff proximately caused by defendant's failure to meet the duty.10 In applying these principles to automobile negligence cases, we have long recognized that drivers have a duty to operate their vehicle with due care.11 To fulfill this duty, a driver must do what a prudent person would do under the cireumstances of each particular case.12 Whether Kuchn's actions meet the standards of due care, is exclusively a question for the jury unless under the facts, reasonable minds could not differ.13 Likewise, negligence is not actionable unless it is the proximate cause of the harm for which plaintiff seeks recovery.14 there is no evidence from which a jury could reasonably find a causal connection.15
114 We first address Kuehn's duty to drive her vehicle with due care. Although a number of important facts are undisputed, the reasonableness of Kuehn's actions must be viewed in light of steps taken by Sankey in stopping to make a left hand turn. It is undisputed that at the time Kuehn decided to cross into the oncoming traffic lane to pass Sankey, (1) Kuchn was aware that Sankey was stopped or stopping; (2) Merrill did not know that Sankey was stopped or stopping as her view was blocked by Kuehn's larger vehicle; (8) Kuehn did not reduce her speed of 60 mph, brake or signal before crossing into the south lane to pass Sankey; (4) Merrill was directly behind Kuehn; (5) Merrill did not see Sankey's stopped vehicle until Kuehn passed Sankey; (6) Kuchn was aware of the approaching motorcycle; (7) Merrill's view of the motorcycle was blocked by Kuchn's larger vehicle; (8) Seconds after Kuehn passed Sankey's vehicle, Merrill collided with the motorcycle; (9) Kuehn sue-cessfully passed Sankey.
15 Whether Kuehn acted reasonably cannot be answered without considering the actions of Sankey. There is disputed evidence and testimony surrounding (1) whether San-key was stopped or stopping, (2) use of her brakes, (3) use of left turn signal and (4) [1228]*1228whether Sankey slammed on her brakes. In addition, we have consistently recognized that the size of the lead vehicle when it blocks the view of the following vehicle is a factor to weigh when determining whether the actions of a driver like Kuehn were reasonable under the cireuamstances.16 Generally speaking, whether the lead vehicle breaches this duty by suddenly swerving, as Kuehn did, is a question for the jury.17 It is impossible on this record to make a determination as a matter of law whether Kuchn's actions were reasonable. The question surrounding the primary negligence of Kuehn is one that rests soundly with the jury.
116 Next we consider the issue of proximate cause. Negligence is not actionable unless it proximately causes the harm for which liability is sought to be imposed. In a negligent tort case, it is generally a fact question for the jury. It becomes one of law only when there is no evidence from which a jury could reasonably find a causal nexus between the act and the injury.18
17 It is uncontroverted that Kuehn without signaling or warning, entered the oncoming traffic lane to pass Sankey. It is also uncontroverted that Merrill followed Kuchn to avoid hitting Sankey, and that Merrill's view was obstructed by Kuehn's vehicle unable to see the approaching motorcycle until Kuehn moved back into her lane of traffic. One potential inference from these facts is reflected in the conclusion reached by OHP that the collision was created by the inattention and failure of Kuehn to reduce her speed for Sankey's slowed or stopped vehicle. Although this is not determinative of proximate cause, it demonstrates there is at least some evidence of a causal nexus between Kuchn's actions, the collision, and plaintiffs' damages, making summary judgment improper.
18 This Court has previously rejected an argument made in a multiple vehicle negligence case with almost identical facts where a co defendant without having a direct collision, like Kuehn, urged this Court to declare as a matter of law their actions represented a "condition" and not a "proximate cause" of the underlying injuries and damages, seeking Judgment in their favor.19 We have consistently held that where facts relevant to questions of primary negligence are in dispute, the issue must be presented to the jury. Likewise, whether the injuries flowing from the original negligence could have been foreseen is a question within the realm of fact and not law.20 The resolution of whether Kuehn's actions were a proximate cause of plaintiffs' injuries is one within the sound discretion of the jury and is not a question of law.
This Court has continually held disputed factual determinations that require weighing the credibility of witnesses and the weight of testimony are to be left to the exclusive province of the jury.21 A summary Judgment cannot become a substitute trial by affidavit instead of a trial according to law.22
120 This Court expresses no view on whether Kuchn's actions constituted negli-genee. The directive is simply that the evidence before this Court contains disputed material facts as well as undisputed material facts that could lead to conflicting inferences. It is the long standing policy of our jurisprudence that such decisions rest solely and soundly with the trier of fact. Accordingly, [1229]*1229the trial court erred when it entered summary judgment in favor of Kuehn.
CERTIORARI PREVIOUSLY GRANTED; COURT OF CIVIL APPEALS' OPINION VACATED; DISTRICT COURTS JUDGMENT REVERSED; AND MATTER REMANDED FOR FURTHER PROCEEDINGS.
REIF, C.J., WATT, EDMONDSON, COLBERT, GURICH, JJ., concur.
COMBS, V.C.J. (by separate writing), KAUGER, WINCHESTER, TAYLOR, JJ., dissent.