O’Connor, J.
In this case, Reliance Insurance Company (Reliance), insurer of a trailer, seeks a declaration under G. L. c. 231A that Aetna Casualty and Surety Company (Aetna), [49]*49insurer of a tractor used with the trailer, is required by its policy to participate in the defense of a tort action to recover for personal injuries brought against Francisco Ortiz, the driver of the tractor-trailer unit, and to indemnify Ortiz against liability. A Superior Court judge determined that the driver was not entitled to coverage under Aetna’s policy and dismissed the complaint. On appeal, the Appeals Court agreed with the reasoning of the judge, vacated the judgment of dismissal as inappropriate in a declaratory judgment action, and ordered the entry of a judgment declaring that Aetna’s policy did not provide coverage. Reliance Ins. Co. v. Aetna Casualty & Sur. Co., 17 Mass. App. Ct. 218,219-220,222 (1983). We granted further appellate review. We reverse the judgment of the Superior Court and order that a judgment be entered declaring that Ortiz is entitled to a defense by Aetna of the tort action against him and to indemnity by Aetna against liability. The costs of defense and the indemnity payments are to be borne equally by Reliance and Aetna until each insurer has paid the lowest applicable limit of liability under one policy, or the full amount of the loss is paid. If each insurer pays the lowest applicable limit of liability under one policy without the full loss being paid, payment is to be made under the other policy until the Ml loss is paid or the limit of that policy is reached.
The tractor-trailer unit, driven by Ortiz, was involved in a collision with another vehicle on March 10, 1978, as a result of which occupants of the other vehicle brought an action to recover for bodily injuries against Ortiz and his employer, Rogers Foam Corporation (Rogers). Rogers owned the trailer portion of the unit and hired the tractor from its owner, Edart Tmck Rental Corporation (Edart). The trailer was insured by Reliance and the tractor was insured by Aetna. Reliance undertook the defense of the tort action and called on Aetna to participate. Aetna disclaimed and this action followed.
The Aetna policy defines “persons insured” as including “any . . . person while using an owned automobile or a hired automobile with the permission of the named insured.” The policy also provides, however, that a “person or organization, other than the named insured,” is not insured with respect to “a [50]*50motor vehicle while used with any trailer owned or hired by such person or organization and not covered by like insurance in [Aetna].” Rogers is not insured under the Aetna policy because the insured tractor was being used with a trailer owned by Rogers and not covered by insurance in Aetna when the collision occurred. That is conceded by Reliance. Reliance contends that Ortiz is covered under the Aetna policy, however, because as the employee of Rogers, which hired the tractor, he was using the tractor with the permission of Aetna’s named insured, Edart. Reliance asserts that Ortiz does not come within the clause excepting certain persons from the definition of insured persons because, although at the time of the collision he was using the insured tractor with a trailer owned by his employer, the trailer was neither owned nor hired by him. We agree.
The plain language of the quoted provisions requires the conclusion that Ortiz is an insured under the Aetna policy. The provision on which Aetna relies to exclude him is significantly different from exclusion (11) contained in the policy reviewed in Desrosiers v. Royal Ins. Co. of Am., ante 37, 43 (1984). There, coverage was not provided under a policy insuring one component of a tractor-trailer unit when the other component was owned or hired by “the insured” and was not covered by like insurance in the same company. The term “the insured” was defined in the policy as including the named insured as well as any other person using the vehicle with the named insured’s permission. We held, in light of the unmistakable purpose of the exclusionary provision, that the exclusion applied if any insured party owned or hired the uninsured tractor-trailer component. We arrived at that conclusion despite an apparently inconsistent severability of interests provision.
We recognize that the purposes of the exclusionary provisions in the Royal Insurance Company of America policy, at issue in Desrosiers, and in the Aetna policy, at issue here, may be the same. However, the language employed in the two policies is quite different. The language in the Aetna policy is not susceptible to the construction we gave to exclusion (11) in Desrosiers. The policy at issue here does not say that a per[51]*51son within the omnibus clause is not insured with respect to the tractor while it is being used with any trailer owned or hired by “the insured” and is not covered by like insurance in Aetna. Instead, it provides that a person within the omnibus clause is not insured with respect to the tractor while it is being used with a trailer owned or hired by “such person” and is not covered by like insurance with Aetna. “[S]uch person” necessarily refers to the person seeking coverage.1 The several interests of the insured parties are recognized in the exclusionary provision as separate in the same way as might be accomplished in appropriate circumstances by a severability of interests provision.
In Desrosiers, we recognized an apparent inconsistency between the tractor-trailer exclusion and a severability of interests provision in the policy in question. The Aetna policy also contains a severability of interests provision, and it states that “[t]he insurance afforded applies separately to each insured against whom claim is made or suit is brought, except with respect to the limits of the company’s liability.” Unlike the policy involved in Desrosiers, the severability of interests provision here is consistent with, and supportive of, the only construction to which the exclusionary provision is reasonably susceptible.
In Reliance Ins. Co. v. Aetna Casualty & Sur. Co., supra at 221-222, the Appeals Court observed that “[t]o apply the severability of interests clause in the manner pressed by Reliance ... is virtually to read the tractor-trailer exclusion out of the policy. Rogers is a corporation. Sightless and armless, it cannot climb behind the driver’s wheel; it must direct an employee to do so. In analogous circumstances the Court of Appeals of New York (Breitel, J.) observed: ‘Since the lessee is excluded, its employee, the driver, should also be excluded as an additional insured .... To hold otherwise deprives the exclusionary language in each policy of any practical meaning in the case of corporate lessees, which perforce act through [52]*52employees.’ Travelers Ins. Co. v. General Acc., Fire & Life Assur. Corp., 28 N.Y.2d 458, 462 (1971). Cf. Travelers Ins. Co. v. United States Fire Ins. Co., 570 F.2d 515, 516 (5th Cir. 1978).”
We share the Appeals Court’s concern that the construction we place on the exclusionary provision here results in the exclusionary provision virtually being read out of the policy. The provision has almost no practical value to Aetna. The value to Aetna of being relieved from covering Rogers is negligible if Aetna must protect and indemnify Ortiz.
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O’Connor, J.
In this case, Reliance Insurance Company (Reliance), insurer of a trailer, seeks a declaration under G. L. c. 231A that Aetna Casualty and Surety Company (Aetna), [49]*49insurer of a tractor used with the trailer, is required by its policy to participate in the defense of a tort action to recover for personal injuries brought against Francisco Ortiz, the driver of the tractor-trailer unit, and to indemnify Ortiz against liability. A Superior Court judge determined that the driver was not entitled to coverage under Aetna’s policy and dismissed the complaint. On appeal, the Appeals Court agreed with the reasoning of the judge, vacated the judgment of dismissal as inappropriate in a declaratory judgment action, and ordered the entry of a judgment declaring that Aetna’s policy did not provide coverage. Reliance Ins. Co. v. Aetna Casualty & Sur. Co., 17 Mass. App. Ct. 218,219-220,222 (1983). We granted further appellate review. We reverse the judgment of the Superior Court and order that a judgment be entered declaring that Ortiz is entitled to a defense by Aetna of the tort action against him and to indemnity by Aetna against liability. The costs of defense and the indemnity payments are to be borne equally by Reliance and Aetna until each insurer has paid the lowest applicable limit of liability under one policy, or the full amount of the loss is paid. If each insurer pays the lowest applicable limit of liability under one policy without the full loss being paid, payment is to be made under the other policy until the Ml loss is paid or the limit of that policy is reached.
The tractor-trailer unit, driven by Ortiz, was involved in a collision with another vehicle on March 10, 1978, as a result of which occupants of the other vehicle brought an action to recover for bodily injuries against Ortiz and his employer, Rogers Foam Corporation (Rogers). Rogers owned the trailer portion of the unit and hired the tractor from its owner, Edart Tmck Rental Corporation (Edart). The trailer was insured by Reliance and the tractor was insured by Aetna. Reliance undertook the defense of the tort action and called on Aetna to participate. Aetna disclaimed and this action followed.
The Aetna policy defines “persons insured” as including “any . . . person while using an owned automobile or a hired automobile with the permission of the named insured.” The policy also provides, however, that a “person or organization, other than the named insured,” is not insured with respect to “a [50]*50motor vehicle while used with any trailer owned or hired by such person or organization and not covered by like insurance in [Aetna].” Rogers is not insured under the Aetna policy because the insured tractor was being used with a trailer owned by Rogers and not covered by insurance in Aetna when the collision occurred. That is conceded by Reliance. Reliance contends that Ortiz is covered under the Aetna policy, however, because as the employee of Rogers, which hired the tractor, he was using the tractor with the permission of Aetna’s named insured, Edart. Reliance asserts that Ortiz does not come within the clause excepting certain persons from the definition of insured persons because, although at the time of the collision he was using the insured tractor with a trailer owned by his employer, the trailer was neither owned nor hired by him. We agree.
The plain language of the quoted provisions requires the conclusion that Ortiz is an insured under the Aetna policy. The provision on which Aetna relies to exclude him is significantly different from exclusion (11) contained in the policy reviewed in Desrosiers v. Royal Ins. Co. of Am., ante 37, 43 (1984). There, coverage was not provided under a policy insuring one component of a tractor-trailer unit when the other component was owned or hired by “the insured” and was not covered by like insurance in the same company. The term “the insured” was defined in the policy as including the named insured as well as any other person using the vehicle with the named insured’s permission. We held, in light of the unmistakable purpose of the exclusionary provision, that the exclusion applied if any insured party owned or hired the uninsured tractor-trailer component. We arrived at that conclusion despite an apparently inconsistent severability of interests provision.
We recognize that the purposes of the exclusionary provisions in the Royal Insurance Company of America policy, at issue in Desrosiers, and in the Aetna policy, at issue here, may be the same. However, the language employed in the two policies is quite different. The language in the Aetna policy is not susceptible to the construction we gave to exclusion (11) in Desrosiers. The policy at issue here does not say that a per[51]*51son within the omnibus clause is not insured with respect to the tractor while it is being used with any trailer owned or hired by “the insured” and is not covered by like insurance in Aetna. Instead, it provides that a person within the omnibus clause is not insured with respect to the tractor while it is being used with a trailer owned or hired by “such person” and is not covered by like insurance with Aetna. “[S]uch person” necessarily refers to the person seeking coverage.1 The several interests of the insured parties are recognized in the exclusionary provision as separate in the same way as might be accomplished in appropriate circumstances by a severability of interests provision.
In Desrosiers, we recognized an apparent inconsistency between the tractor-trailer exclusion and a severability of interests provision in the policy in question. The Aetna policy also contains a severability of interests provision, and it states that “[t]he insurance afforded applies separately to each insured against whom claim is made or suit is brought, except with respect to the limits of the company’s liability.” Unlike the policy involved in Desrosiers, the severability of interests provision here is consistent with, and supportive of, the only construction to which the exclusionary provision is reasonably susceptible.
In Reliance Ins. Co. v. Aetna Casualty & Sur. Co., supra at 221-222, the Appeals Court observed that “[t]o apply the severability of interests clause in the manner pressed by Reliance ... is virtually to read the tractor-trailer exclusion out of the policy. Rogers is a corporation. Sightless and armless, it cannot climb behind the driver’s wheel; it must direct an employee to do so. In analogous circumstances the Court of Appeals of New York (Breitel, J.) observed: ‘Since the lessee is excluded, its employee, the driver, should also be excluded as an additional insured .... To hold otherwise deprives the exclusionary language in each policy of any practical meaning in the case of corporate lessees, which perforce act through [52]*52employees.’ Travelers Ins. Co. v. General Acc., Fire & Life Assur. Corp., 28 N.Y.2d 458, 462 (1971). Cf. Travelers Ins. Co. v. United States Fire Ins. Co., 570 F.2d 515, 516 (5th Cir. 1978).”
We share the Appeals Court’s concern that the construction we place on the exclusionary provision here results in the exclusionary provision virtually being read out of the policy. The provision has almost no practical value to Aetna. The value to Aetna of being relieved from covering Rogers is negligible if Aetna must protect and indemnify Ortiz. However, the court cannot properly disregard the plain language of the policy in order to give effect to what it considers the intentions of the parties probably to have been. To the extent that the severability of interests provision was rendered meaningless by our construction of exclusion (11) in Desrosiers, we concluded that that was required by the plain language of that exclusion. Similar language does not appear here, which leads us to conclude that we are not required effectively to delete the severability of interests provision from the policy nor would it be appropriate for us to do so.
We briefly mention one other contention of Aetna. In its brief, Aetna calls to our attention special endorsement (1), which provides as follows: “The insurance provided by this policy does not apply to any lessee with respect to automobiles leased to others for which the insurance is purchased by the lessee, in evidence of which a valid certificate of insurance has been filed with the lessor.” Rogers filed a certificate of insurance with Edart indicating coverage by Reliance for bodily injury. Aetna contends that by virtue of that endorsement the policy provides no coverage to Rogers or Ortiz. No reasons are given in support of Aetna’s contention as required by Mass. R. A. P. 16 (a) (4), as amended, 367 Mass. 919 (1975). In any event, Reliance does not contend that Rogers is entitled to coverage, and Ortiz was not a lessee of the tractor.
Finally, we must determine the apportionment of the loss between Aetna and Reliance. The apportionment of the loss is governed by the “other insurance” clause contained in each policy. The sanie “other insurance” clause appears in both policies and reads as follows:
[53]*53“Other Insurance. The insurance afforded by this policy is primary insurance, except when stated to apply in excess of or contingent upon the absence of other insurance. When this insurance is primary and the insured has other insurance which is stated to be applicable to the loss on an excess or contingent basis, the amount of the company’s liability under this policy shall not be reduced by the existence of such other insurance.
“When both this insurance and other insurance apply to the loss on the same basis, whether primary, excess or contingent, the company shall not be liable under this policy for a greater proportion of the loss than that stated in the applicable contribution provision below:
“(a) Contribution by Equal Shares. If all of such other valid and collectible insurance provides for contribution by equal shares, the company shall not be liable for a greater proportion of such loss than would be payable if each insurer contributes an equal share until the share of each insurer equals the lowest applicable limit of liability under any one policy or the full amount of the loss is paid, and with respect to any amount of loss not so paid the remaining insurers then continue to contribute equal shares of the remaining amount of the loss until each such insurer has paid its limit in full or the full amount of the loss is paid.
“(b) Contribution by Limits. If any of such other insurance does not provide for contribution by equal shares, the company shall not be liable for a greater proportion of such loss than the applicable limit of liability under this policy for such loss bears to the total applicable limit of liability of all valid and collectible insurance against such loss.”
Aetna contends, and Reliance agrees, that if Aetna is obliged to defend and indemnify Ortiz, subdivision (a) of the “other insurance” provision applies, and each insurer must contribute equally to the costs and amounts to be paid until each insurer has paid the lowest applicable limit of liability under one policy, or the full amount of the loss is paid. We see no reason to hold otherwise. See McDaniels v. Great Atl. & Pac. Tea Co., 602 F.2d 78, 83 (5th Cir. 1979); Ryder Truck Rental, Inc. v. United States Fidelity & Guar. Co., 527 F. Supp. 666, [54]*54670 (E.D. Mo. 1981); Commercial Union Assurance Cos. v. Aetna Casualty & Sur. Co., 455 F. Supp. 1190, 1194-1195 (D.N.H. 1978). Therefore, we need not reach the further argument of Reliance that “[i]f for any reason the Aetna and Reliance policy provisions are not deemed controlling on the question of apportionment. . . , this Court should. . . apportion the total primary coverage on the basis of a ratio of policy limits.”
Accordingly, we reverse the judgment of the Superior Court and order that a judgment be entered declaring that Ortiz is entitled to a defense by Aetna of the tort action against him arising out of the motor vehicle collision on March 10, 1978, and to indemnity by Aetna from liability for personal injuries caused thereby. The costs of defense and the indemnity payments are to be borne equally by Reliance and Aetna until each insurer has paid the lowest applicable limit of liability under one policy or the full amount of the loss is paid. If each insurer pays the lowest applicable limit of liability under one policy without the full loss being paid, payment is to be made under the other policy until the full loss is paid or the limit of that policy is reached.
So ordered.