Smith, J.
Petitioner State Farm Mutual Automobile Insurance Company seeks review of a Court of Appeals decision which affirmed a summary judgment by the Spokane County Superior Court which granted underinsured motorist insurance coverage to Respondents Clyde and Betty L. Ross, husband and wife, under a policy on an automobile registered in the wife’s name and insured in Washington for an accident the wife had in Washington while driving an automobile registered in the husband’s name and insured in Montana. This Court granted review. We reverse.
QUESTION PRESENTED
The question presented in this case is whether a Washington resident, a married woman, injured in the State of Washington while driving an automobile insured in her name and the name of her husband by State Farm Insurance Company (State Farm) and registered only in the name of her husband in Montana, may recover Under-insured Motorist (UIM) benefits under another policy issued to them by State Farm covering an automobile registered and insured only in her own name in the State of Washington when that policy provides no UIM coverage for a "motor vehicle owned or available for the regular use of [the insured], [the insured’s] spouse or any other relative, if it is not insured under the liability coverage of [the] policy.”
STATEMENT OF FACTS
The facts in this case were stipulated by the parties.1 [511]*511Respondent Betty L. Ross was driving a 1980 AMC Eagle in Spokane, Washington on February 19, 1987 when she was injured in a collision with a Pizza Haven vehicle.2
Respondents Ross at all times material were husband and wife, living in the State of Washington and maintaining their family residence in Spokane. Because of work opportunities Respondent Clyde Ross maintained a temporary residence in Libby, Montana. His wife maintained the family residence in Spokane.
After moving to Washington about five years earlier, Respondents acquired a 1977 Chevrolet Monte Carlo, registered to Respondent Betty L. Ross and licensed in the State of Washington; and a 1980 AMC Eagle, registered to Respondent Clyde Ross and licensed in the State of Montana where he was employed.3 Both automobiles were insured by State Farm:
Automobile
Registered to Betty L. Ross
Registered to Clyde Ross
Vehicle 1977 Chevrolet Monte Carlo 1980 AMC Eagle
Location Spokane, Washington Libby, Montana
Insurance State Farm Insurance State Farm Insurance
Washington Policy Number Montana Policy Number 2615-663-A20-47 1224-709-26
The vehicles were insured under two separate State Farm policies because State Farm would not insure the two automobiles under the same policy.
The 1980 AMC Eagle had a Montana certificate of title showing the owner’s name and address as "Ross, Clyde E., [512]*512Box 375, Libby, MT 59923.”4 It was purchased on September 30, 1986 in Montana and principally garaged there.5 State Farm of Montana insured the Eagle for liability and uninsured motorist coverage, but not for underinsured motorist coverage.6 Although Mr. Ross maintained a temporary residence in Montana, he would return to Washington on weekends to spend time with his wife.7
Respondents Ross could have elected to have underinsured motorist coverage under the Montana policy. They did not.8 Under Montana law, they would not then be covered for it.9 Respondents could have elected not to have underinsured motorist coverage under the Washington policy. They did not.10 But under Washington law, they would have underinsured motorist coverage.11 Thus the State Farm of Washington policy on the 1977 Chevrolet Monte Carlo does provide underinsured motorist coverage while the State Farm of Montana policy on the 1980 AMC Eagle does not.12
Because of her employment, Ms. Ross lived in Spokane, Washington where she maintained the family residence. She usually drove the Chevrolet Monte Carlo which was registered in her name and principally garaged in Washington. State Farm of Washington insured the Monte [513]*513Carlo for liability and uninsured and underinsured motorist coverage.13
The weekend before the accident the Rosses exchanged automobiles because the Monte Carlo required repairs and Mr. Ross took it to Montana for that purpose.14 Ms. Ross was driving the Eagle in Spokane when she was involved in the accident. Respondents stipulated the Eagle was available for Ms. Ross’ regular use "either as a driver or passenger, when she and her husband were together either in Washington or Montana.”15 She stated that even though she could have driven the Eagle during her infrequent visits to Montana, she actually only drove it during the week the Monte Carlo was in Montana for repairs.
The parties filed cross motions for summary judgment in the Spokane County Superior Court.16 On November 18, 1994, the Honorable Richard J. Schroeder granted partial summary judgment in favor of Respondents Ross, determining that the State Farm of Washington policy provided underinsured motorist coverage for the loss incurred by Ms. Ross while driving the Eagle on February 19, 1987.17 The court also granted Respondents’ request for attorney fees and costs as the prevailing parties on their UIM claim.18 The court denied Respondents’ claims under the [514]*514Washington Insurance Act and Washington Consumer Protection Act. Those claims are not before this court.
On December 7, 1994, State Farm filed a notice of appeal to the Court of Appeals, Division III.19 That court, the Honorable John A. Schultheis writing, affirmed the trial court.20 It concluded Respondents Clyde Ross and Betty L. Ross were not "spouses” as defined in the policy because, although Mr. Ross was Ms. Ross’ "legal spouse,” he was not in fact "living with” her at the time of the accident as the policy required under its definition of "spouse.”21 The court considered all the circumstances pertaining to ownership of the Eagle before concluding that, even though it was stipulated that Ms. Ross.owned the Eagle, it referred to legal ownership under Washington community property law and not ownership contemplated by the policy.22 The court also determined the Eagle was a "temporary substitute” vehicle under the policy and was not available for Ms. Ross’ regular use and that her isolated use of the automobile did not amount to regular use under terms of the policy.23
On August 16, 1996, State Farm filed a "Motion to Reconsider or, in the Alternative, to Depublish [sic] Opinion.” On August 29, 1996, Chief Judge Dennis J. Sweeney denied the motion. This Court granted review on January 7, 1997.
DISCUSSION
Standard of Review
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Smith, J.
Petitioner State Farm Mutual Automobile Insurance Company seeks review of a Court of Appeals decision which affirmed a summary judgment by the Spokane County Superior Court which granted underinsured motorist insurance coverage to Respondents Clyde and Betty L. Ross, husband and wife, under a policy on an automobile registered in the wife’s name and insured in Washington for an accident the wife had in Washington while driving an automobile registered in the husband’s name and insured in Montana. This Court granted review. We reverse.
QUESTION PRESENTED
The question presented in this case is whether a Washington resident, a married woman, injured in the State of Washington while driving an automobile insured in her name and the name of her husband by State Farm Insurance Company (State Farm) and registered only in the name of her husband in Montana, may recover Under-insured Motorist (UIM) benefits under another policy issued to them by State Farm covering an automobile registered and insured only in her own name in the State of Washington when that policy provides no UIM coverage for a "motor vehicle owned or available for the regular use of [the insured], [the insured’s] spouse or any other relative, if it is not insured under the liability coverage of [the] policy.”
STATEMENT OF FACTS
The facts in this case were stipulated by the parties.1 [511]*511Respondent Betty L. Ross was driving a 1980 AMC Eagle in Spokane, Washington on February 19, 1987 when she was injured in a collision with a Pizza Haven vehicle.2
Respondents Ross at all times material were husband and wife, living in the State of Washington and maintaining their family residence in Spokane. Because of work opportunities Respondent Clyde Ross maintained a temporary residence in Libby, Montana. His wife maintained the family residence in Spokane.
After moving to Washington about five years earlier, Respondents acquired a 1977 Chevrolet Monte Carlo, registered to Respondent Betty L. Ross and licensed in the State of Washington; and a 1980 AMC Eagle, registered to Respondent Clyde Ross and licensed in the State of Montana where he was employed.3 Both automobiles were insured by State Farm:
Automobile
Registered to Betty L. Ross
Registered to Clyde Ross
Vehicle 1977 Chevrolet Monte Carlo 1980 AMC Eagle
Location Spokane, Washington Libby, Montana
Insurance State Farm Insurance State Farm Insurance
Washington Policy Number Montana Policy Number 2615-663-A20-47 1224-709-26
The vehicles were insured under two separate State Farm policies because State Farm would not insure the two automobiles under the same policy.
The 1980 AMC Eagle had a Montana certificate of title showing the owner’s name and address as "Ross, Clyde E., [512]*512Box 375, Libby, MT 59923.”4 It was purchased on September 30, 1986 in Montana and principally garaged there.5 State Farm of Montana insured the Eagle for liability and uninsured motorist coverage, but not for underinsured motorist coverage.6 Although Mr. Ross maintained a temporary residence in Montana, he would return to Washington on weekends to spend time with his wife.7
Respondents Ross could have elected to have underinsured motorist coverage under the Montana policy. They did not.8 Under Montana law, they would not then be covered for it.9 Respondents could have elected not to have underinsured motorist coverage under the Washington policy. They did not.10 But under Washington law, they would have underinsured motorist coverage.11 Thus the State Farm of Washington policy on the 1977 Chevrolet Monte Carlo does provide underinsured motorist coverage while the State Farm of Montana policy on the 1980 AMC Eagle does not.12
Because of her employment, Ms. Ross lived in Spokane, Washington where she maintained the family residence. She usually drove the Chevrolet Monte Carlo which was registered in her name and principally garaged in Washington. State Farm of Washington insured the Monte [513]*513Carlo for liability and uninsured and underinsured motorist coverage.13
The weekend before the accident the Rosses exchanged automobiles because the Monte Carlo required repairs and Mr. Ross took it to Montana for that purpose.14 Ms. Ross was driving the Eagle in Spokane when she was involved in the accident. Respondents stipulated the Eagle was available for Ms. Ross’ regular use "either as a driver or passenger, when she and her husband were together either in Washington or Montana.”15 She stated that even though she could have driven the Eagle during her infrequent visits to Montana, she actually only drove it during the week the Monte Carlo was in Montana for repairs.
The parties filed cross motions for summary judgment in the Spokane County Superior Court.16 On November 18, 1994, the Honorable Richard J. Schroeder granted partial summary judgment in favor of Respondents Ross, determining that the State Farm of Washington policy provided underinsured motorist coverage for the loss incurred by Ms. Ross while driving the Eagle on February 19, 1987.17 The court also granted Respondents’ request for attorney fees and costs as the prevailing parties on their UIM claim.18 The court denied Respondents’ claims under the [514]*514Washington Insurance Act and Washington Consumer Protection Act. Those claims are not before this court.
On December 7, 1994, State Farm filed a notice of appeal to the Court of Appeals, Division III.19 That court, the Honorable John A. Schultheis writing, affirmed the trial court.20 It concluded Respondents Clyde Ross and Betty L. Ross were not "spouses” as defined in the policy because, although Mr. Ross was Ms. Ross’ "legal spouse,” he was not in fact "living with” her at the time of the accident as the policy required under its definition of "spouse.”21 The court considered all the circumstances pertaining to ownership of the Eagle before concluding that, even though it was stipulated that Ms. Ross.owned the Eagle, it referred to legal ownership under Washington community property law and not ownership contemplated by the policy.22 The court also determined the Eagle was a "temporary substitute” vehicle under the policy and was not available for Ms. Ross’ regular use and that her isolated use of the automobile did not amount to regular use under terms of the policy.23
On August 16, 1996, State Farm filed a "Motion to Reconsider or, in the Alternative, to Depublish [sic] Opinion.” On August 29, 1996, Chief Judge Dennis J. Sweeney denied the motion. This Court granted review on January 7, 1997.
DISCUSSION
Standard of Review
This case was decided in the trial court on a mo[515]*515tion for summary judgment upon stipulated facts.24 "A summary judgment may not be granted unless there is no genuine issue as to any material fact.”25 Because the facts were stipulated, there is no dispute of material facts. "Where there are no relevant facts in dispute, the applicable standard of review is de novo review of lower court decisions regarding insurance coverage.”26 The applicable coverage depends upon the language of the insurance policy. "The insurance policy must be given a fair, reasonable, and sensible construction as would be given by an average insurance purchaser.”27 "The interpretation of insurance policy language is a question of law.”28 This court has stated that
In construing the language of an insurance policy, the entire contract must be construed together so as to give force and effect to each clause. If the language in an insurance contract is clear and unambiguous, the court must enforce it as written and may not modify the contract or create ambiguity where none exists. However, if the policy provision on its face is fairly susceptible to two different but reasonable interpretations, the policy is ambiguous and the court must attempt to discern and enforce the contract as the parties intended.[29]
If the portion of the policy being considered is an inclusionary clause in the insurance policy, the ambiguity should be liberally construed to provide coverage when[516]*516ever possible.30 However, the basic principle that applies to exclusionary clauses in insurance contracts is that any ambiguity should be "most strictly construed against the insurer.”31 The fundamental public policy underlying the "Washington UIM provision is full compensation for victims of automobile accidents.32
Arguments of the Parties
Petitioner State Farm argues the Montana policy on the AMC Eagle does not provide underinsured motorist coverage; and because the Pizza Haven driver did have insurance, the uninsured motorist provision in the Eagle policy is not applicable. Petitioner asserts that in order to have underinsured motorist coverage on the Eagle, Respondents were required to specifically request and purchase it under the Montana policy; but they did not. We address only the Washington policy on the Chevrolet Monte Carlo in this opinion because the parties do not otherwise address the Montana policy on the AMC Eagle.
"An underinsured motorist is one causing injury whose [liability] coverage is insufficient to meet the damages inflicted. When an underinsured motorist causes injury, the insurance company of the injured party carrying UIM steps into the shoes of the negligent underinsured and supplements [the] policy.”33 An uninsured motorist is one [517]*517who does not have any liability insurance.34 The purpose of uninsured motorist coverage is to provide an injured party recovery for those damages which would have been recovered if the responsible party had maintained liability insurance.35
The State Farm of Washington policy for the Monte Carlo provides coverage for an insured driver while driving a temporary substitute vehicle.36 Because this is an inclusionary provision in the policy, it should be liberally construed. The policy defines "temporary substitute car” as "a car not owned by you or your spouse, if it replaces your car for a short time. . . . Your car has to be out of use due to its breakdown, repair, servicing, damage or loss.”37 The policy also contains exclusions to UIM coverage. The policy does not provide coverage for bodily injury to an insured while that person is operating or occupying a "vehicle owned or available for the regular use of [the insured, the insured’s] spouse or any other relative.”38
Petitioner State Farm claims the Washington policy on the Monte Carlo does not apply to the accident which occurred while Ms. Ross was driving the AMC Eagle. It argues that if the Court of Appeals had acknowledged the facts stated in the stipulation, it would have determined there was no UIM coverage under the stipulated facts. Petitioner argues that, under the rules of construction and the stipulated facts, the UIM provision in the Washington policy does not apply to the AMC Eagle.39
All parties acknowledge that factual stipulations are [518]*518generally binding on the parties and on the court.40 However, they do not agree on the question whether the court applied the stipulated facts to the insurance policy or whether the court ignored the stipulated facts. Petitioner argues the court ignored the stipulated facts when it concluded that under the policy Mr. Ross was not the spouse of Ms. Ross, that Ms. Ross did not own the Eagle, and that the Eagle was not available for her regular use.
Respondents assert that the parties stipulated only to the existence of certain facts, not to the "legal effect” of those facts.41 They state that a factual stipulation does not control a court’s legal determination.42 This is a mixed question of fact and law.43
Respondents stipulated they were "married on November 14, 1963 and have remained married to this date and at all times material to this lawsuit.”44 The stipulation did not refer to them as "spouses,” but they meet the common definition of the word, which is a "man and a woman joined in wedlock.”45 However, the State Farm of Washington insurance policy specially defines "spouse” as "your husband or wife while living with you,”46 In this case the court did not ignore the fact of the Rosses’ long-term intact marriage, but concluded that because Ms. Ross was living in Washington while Mr. Ross was living in Montana, he was not her "spouse” under the specific language of the [519]*519policy. Thus, although the court applied the stipulated facts to the policy, it nevertheless determined Mr. Ross was not Ms. Ross’ spouse under the language of the policy, even though they have been legally married and have been husband and wife for more than thirty years.
The court then considered ownership of the AMC Eagle. The stipulated facts state that "[a]t the time of the incident, Betty L. Ross and her husband, Clyde Ross, owned two vehicles.”47 It was also stipulated the Eagle "was purchased with funds which Mr. Ross had earned while he and [Ms.] Ross were married . . . .”48 The court also considered other stipulated facts showing indicia of ownership. "Mr. Ross was the title owner and registered owner, and he had possession, care, control and management of the Eagle.”49 The court stated the word "owner” can be ambiguous and the court has found it ambiguous in other contexts.50 The court concluded that while Ms. Ross may legally own the Eagle under Washington community property law, that did not mean she owns it under the language of the State Farm of Washington policy.
The court considered the exclusions under the UIM provision which disallow coverage for a "vehicle owned or available for the regular use” of the insured. The Court of Appeals determined the Eagle "clearly was not owned for the regular use of Ms. Ross.”51 The purpose of exclusionary clauses is to "provide coverage for isolated use without the payment of an additional premium, but to disallow [520]*520the interchangeable use of other cars which are not covered by the policy.”52
In considering "regular use,” this Court concluded a regular use exclusion did not apply to an isolated "special” use of a vehicle.53 "[I]t is the fact of regular use and not the purpose of that use that is the relevant issue. An insurance company’s legitimate interest is in preventing an increase in the quantum of risk without a corresponding increase in the premium; the risk to the insurance company is related only to the amount of time the car is driven, not to the reason that car is driven.”54
Respondents stipulated the AMC Eagle "was available for the regular use of Betty L. Ross, either as a driver or passenger, when she and her husband were together either in Washington or Montana. . . . Although she could have driven the Eagle during these visits to Montana, she never did so. Betty L. Ross drove the car in Washington only during February 1987 while the Monte Carlo she ordinarily drove was being repaired in Montana.”55 The vehicles were individually garaged in different states and each automobile was driven almost exclusively by one spouse or the other,56 but the Rosses under the stipulation acknowledged that the only time Ms. Ross had ever driven the AMC Eagle was the week of the accident.
Petitioner cites two statutes to support its contention that insurance policies should be read in their entirety [521]*521and that no modification is valid unless it is in writing and made a part of the policy.57 Petitioner correctly states the interpretation of insurance policy language is a question of law.58 Clear policy language must be enforced as written and the policy should be given the fair, reasonable and sensible construction that would be given by the average person purchasing insurance.59 Petitioner also states "the court is directed to avoid strained or forced construction which might lead to absurd or nonsensical results.”60 Petitioner suggests the policy construction given by the Court of Appeals led to an absurd result when it concluded that under the language of the policy Ms. Ross did not own the Eagle and it was not available for her regular use.
State Farm claims the Rosses were spouses, that Ms. Ross owned the Eagle and it was available for her "regular use,” even though the Rosses could not obtain coverage for both the Chevrolet Monte Carlo and the AMC Eagle under one policy with State Farm.61
The Court of Appeals and the trial court were in error in concluding the State Farm of Washington insurance [522]*522policy on the 1977 Chevrolet Monte Carlo automobile provided UIM coverage for Respondent Betty L. Ross when she was driving the 1980 AMC Eagle automobile while the Monte Carlo was being repaired.
Under the stipulation of the parties, it is not logical to conclude that Respondents Clyde and Betty L. Ross were not spouses and that the two of them did not own both the 1977 Chevrolet Monte Carlo and the 1980 AMC Eagle. Nor is it logical to conclude that the Rosses were not living with each other. The exclusionary provisions of the State Farm of Washington policy on to the 1977 Chevrolet Monte Carlo are clear and unambiguous. The Rosses are bound by the terms of that policy. They are not entitled to UIM coverage under the stipulated facts in this case.
Attorney Fees
Respondents Ross seek an award of attorney fees under Rule of Appellate Procedure (RAP) 18.1.62 Petitioner does not address this issue in its brief to this Court.63 An insured who is compelled to assume the burden of legal action to obtain the benefit of its insurance contract is entitled to attorney fees.64 But under our decision in this case Respondents are not entitled to attorney fees on appeal.
SUMMARY AND CONCLUSIONS
The interpretation of an insurance policy is a question [523]*523of law.65 Courts should interpret the policy with a fair, reasonable and sensible construction.66 Where there is an ambiguity, an inclusionary clause in an insurance policy should be construed liberally, while an exclusionary clause should be construed strictly against the insurer.67 There is no ambiguity in the relevant provisions of the policy in this case.
Stipulated facts are generally binding on the parties and the court. However, a factual stipulation does not control the legal determination to be made by the court.68 This is a mixed question of fact and law.69 Under the stipulated facts and the law in this case, Petitioner State Farm is entitled to favorable judgment on review by this Court.
The Court of Appeals and the trial court erred in determining Respondent Clyde Ross was not Respondent Betty L. Ross’ spouse under language of the State Farm of Washington policy. That policy specially defines "spouse” as "your husband or wife while living with you.” Respondents Ross at all times relevant to this case have been husband and wife since their marriage on November 4, 1963. Ms. Ross maintained the family residence in Spokane, Washington while Mr. Ross maintained a temporary residence in Libby, Montana because of his employment. It cannot be concluded they were not "living with” each other as husband and wife.
Notwithstanding title registration of the 1977 Chevrolet Monte Carlo in Ms. Ross’ name only and title registration of the 1980 AMC Eagle in Mr. Ross’ name only, the Court of Appeals and the trial court were not correct in concluding Ms. Ross was not an owner of the AMC Eagle.
[524]*524 In determining "regular use,” this court has stated that the "risk to the insurance company is related only to the amount of time the car is driven, not to the reason it is driven.”70 An insurance company’s legitimate interest is in preventing an increase in the quantum of risk without a corresponding increase in the premium.71
State Farm Insurance Company is entitled to insist upon the terms of its Washington policy issued to Respondents for the 1977 Chevrolet Monte Carlo registered in the name of Betty L. Ross in denying her underinsured motorist coverage while driving the 1980 AMC Eagle registered in Montana in the name of her husband, Respondent Clyde Ross.
We reverse the Court of Appeals, Division III, which affirmed the Spokane County Superior Court in granting summary judgment in favor of Respondents extending UIM coverage under a State Farm insurance policy to Respondent Betty L. Ross for the accident she had in Spokane, Washington on February 19, 1987 while driving an automobile registered in Montana in the name of her husband, Respondent Clyde Ross, and insured under another policy with State Farm.
Dolliver, Guy, Johnson, Talmadge, and Sanders, JJ., concur.