The trial court properly allowed plaintiffs to stack the $250,000 underinsured motorist limits for each of the insureds’ three vehicles with respect to the claim for the injuries suffered by one plaintiff when an underinsured motorist drove his vehicle into a convenience store building in which she was standing, since plaintiffs’ policy listed each vehicle separately in the vehicle coverages section, thereby creating an ambiguity to the extent that the insureds could reasonably presume separate underinsured motorist coverage limits applied to each covered vehicle and that the limits could be stacked because separate underinsured motorist premiums were paid for each vehicle.