## Facts

- Stephen Klanseck, an auto mechanic, bought a Honda GL 1000 motorcycle from Anderson Sales & Service, Inc.; American Honda Motor Co., Inc. was the manufacturer.
- Hours after purchase, while riding about 55 mph, the motorcycle began to fishtail; Klanseck removed his hand from the throttle, applied the front brake, the motorcycle slid, and he fell.
- He initially received sutures and was released; a right-wrist fracture was diagnosed about twelve days later, and he later reported chronic left arm/hand pain, numbness, and tingling that interfered with work and allegedly contributed to a serious mental disorder.
- Investigation found the front tire had deflated; a small hole or short slit in the front inner tube was located where it contacted the rim.
- Klanseck’s expert opined the slit could have been caused by contact with spoke heads because a protective rubber strip was improperly placed; defendants’ expert disputed causation.
- At the time of the accident, Klanseck lacked the required motorcycle endorsement and had limited motorcycle experience (approximately three hours on a comparable motorcycle and about ten hours on a small dirt bike).
- A neurologist later recommended additional diagnostic testing; Klanseck declined unless his condition worsened.

## Issues

1. Whether the trial court erred by instructing the jury it could infer negligence from Klanseck’s violation of Michigan’s motorcycle-endorsement licensing statutes when evidence suggested inexperience or incompetence may have contributed to the accident.
2. Whether the trial court erred by instructing the jury on mitigation of damages based on evidence that Klanseck did not follow recommended medical testing.

## Decision

- The Michigan Supreme Court affirmed.
- The court held the licensing-related instruction was proper where evidence raised an issue that the rider’s inexperience or incompetence may have been a causal factor; the jury could permissively infer negligence from the licensing violation and then determine proximate cause.
- The court held the mitigation instruction was proper where evidence showed Klanseck declined recommended diagnostic testing; the jury could decide whether that refusal was unreasonable and increased damages.
- The judgment for plaintiff (with comparative negligence reducing recovery) was left intact.

## Legal Principles

- A violation of a licensing statute may be submitted to the jury as evidence supporting a permissive inference of negligence when there is evidence that the statutory purpose (operator competence/experience) relates to the accident and may have causally contributed.
- Such an instruction is permissive, not conclusive; the jury must still determine whether any negligence was a proximate cause of the injury.
- A plaintiff has a duty to use ordinary care to minimize post-injury damages; damages attributable to an unreasonable failure to follow reasonable medical advice are not recoverable.
- A mitigation-of-damages instruction is warranted when there is some evidentiary basis that the plaintiff declined recommended treatment or testing that could affect the course or severity of the claimed injuries.

## Conclusion

The Michigan Supreme Court approved submitting to the jury both (1) a permissive negligence inference based on a motorcycle-endorsement violation when supported by evidence linking inexperience to the accident and (2) mitigation of damages where evidence showed the plaintiff refused recommended diagnostic testing, leaving the jury to decide causation and damages consequences.


Klanseck v. Anderson Sales & Serv., Inc., 426 Mich. 78, 393 N.W.2d 356 (Mich. 1986)