On 29 July 1993, plaintiff was involved in an automobile accident with one of defendant’s insureds, John Brandt. Brandt held two separate policies issued by defendant: an Auto Policy which listed his 1988 Hyundai as the covered auto, and a Motorcycle Policy which listed his 1985 Yamaha motorcycle as the covered auto. Brandt was driving a rental vehicle at the time of the collision because his 1988 Hyundai was being repaired. Each policy contained identical language and liability limits of $100,000. Plaintiff sustained damages in excess of $225,000, and sought a determination of whether she may combine the liability coverages from Brandt’s two policies. On 27 May 1998, the trial judge signed an order granting summary judgment for plaintiff. We affirm.
The rules of construction of insurance contracts are well established. Language must be given its ordinary, plain meaning unless a word is ambiguous; ambiguous words are those “reasonably capable of more than one meaning.” State Auto. Mut. Ins. Co. v. Hoyle, 106 N.C. App. 199, 201, 415 S.E.2d 764, 765, disc. review denied, 331 N.C. 557, 417 S.E.2d 803 (1992). “Where the policy language is clear and unambiguous, the court’s only duty is to determine the legal effect of the language used and to enforce the agreement as written.” Cone Mills Corp. v. Allstate Ins. Co., 114 N.C. App. 684, 687, 443 S.E.2d 357, 359 (1994), disc. review improvidently allowed, 340 N.C. 353, 457 S.E.2d 300 (1995). A court may not operate “under the guise of interpreting [an] ambiguous provision” to avoid enforcing the contract as written. Id. Furthermore, exclusionary clauses must be construed in favor of coverage. See N. C. Farm Bureau Mut. Ins. Co. v. Walton, 107 N.C. App. 207, 209, 418 S.E.2d 837, 839 (1992).
*73Brandt’s policies, which are his insurance contracts with defendant, contain identical language. The policies provide, in pertinent part and with original emphasis:
In return for payment of the premium and subject to all the terms of this policy, we agree with you as follows:
Your covered auto means:
1. Any vehicle shown in the Declarations.
4. Any auto or trailer not owned by you while used as a temporary substitute for any other vehicle described in this definition which is out of normal use because of its:
d. loss; or
PART A — LIABILITY COVERAGE — COVERAGE A
We will pay damages for bodily injury or property damage for which any insured becomes legally responsible because of an auto accident.
Insured as used in this Part means:
1. You or any family member for the ownership, maintenance or use of any auto or trailer.
*742. Any person using your covered auto.
3. For your covered auto, any person or organization but only with respect to legal responsibility for acts or omissions of a person for whom coverage is afforded under this Part.
4. For any auto or trailer, other than your covered auto, any person or organization but only with respect to legal responsibility for acts or omissions of you or any family member for whom coverage is afforded under this Part.
B. We do not provide Liability Coverage for the ownership, maintenance or use of:
1. Any vehicle, other than your covered auto, which is:
a. owned by you; or
b. furnished for your regular use.
The Automobile Policy lists Brandt as the named insured and the 1988 Hyundai as the covered vehicle. Defendant tendered its policy limits of $100,000 under the Automobile Policy to plaintiff because the rental car was a covered auto under section 4(b) of the definition of covered auto. Accordingly, the Motorcycle Policy alone is the subject of this appeal.
Under the Motorcycle Policy, Brandt is the named insured. Under the Insuring Agreement section of the policy, “insured” refers to Brandt for the use of “any auto.” Defendant thus agreed to pay for bodily injury for which Brandt, using “any auto,” became responsible because of an automobile accident. Plaintiff has met her burden of proving coverage under defendant’s Motorcycle Policy. See Kruger v. State Farm Mut. Auto. Ins. Co., 102 N.C. App. 788, 790, 403 S.E.2d 571, 572 (1991).
Defendant contends, however, that Exclusion B negates coverage under Brandt’s Motorcycle policy. Defendant would have this Court *75say as a matter of law that since the rental car was a substitute for an owned vehicle, it must be considered owned by Brandt or furnished for Brandt’s regular use. Here, the rental car was neither a vehicle owned by Brandt nor a vehicle furnished for his regular use. See N. C. Farm Bureau Mut. Ins. Co. v. Warren, 326 N.C. 444, 446-47, 390 S.E.2d 138, 140 (1990) (holding that determination of “furnished for regular use” is fact specific inquiry and two general classes have emerged: where employer has furnished vehicle for employee and where vehicle has been purchased but title not yet transferred). We are without authority to rewrite defendant’s contract for insurance, and we cannot say that a rental car, agreed by the parties to be a temporary substitute and for which Brandt paid, is a vehicle furnished for his regular use. We note that defendant is free to explicitly prevent this situation in the future with precise contractual language. See, e.g., American Standard Ins. Co. of Wis. v. Ekeroth, 791 P.2d 1220, 1221 (Colo. Ct. App.) (approving an auto insurer’s limitation of liability clause that read “[t]he total limit of our liability under all policies issued to you by us shall not exceed the highest limit of liability under any one policy”), cert. denied, 797 P.2d 1299 (1990); Butler v. Robinette, 614 S.W.2d 944, 946-47 (Ky. 1981) (approving an auto insurer’s limitation of liability clause which provided that if more than one policy was issued to an insured, the total liability of the company would not exceed the greater of the limits of the several policies).
Defendant has not met its burden of showing coverage is excluded under Brandt’s Motorcycle Policy. See Kruger, 102 N.C. App. at 790, 403 S.E.2d at 572. Accordingly, we affirm the trial court’s order of summary judgment for plaintiff.
Judges GREENE and HORTON concur.