[562]*562OPINION
RABINO WITZ, Justice.
On January 2, 1977, while acting in the scope of his employment, John Richey was killed when his vehicle left the road near Long Lake at Mile 86.4 of the Glenn Highway. Industrial Indemnity Company of Alaska paid workers’ compensation benefits to Richey’s wife and brought this action against the State of Alaska under AS 23.-30.0151 and the Alaska Tort Claims Act, AS 09.50.250-.300.
The complaint alleged that the state’s negligence was the proximate cause of Ri-chey’s death. Various specific acts and omissions were referred to as constituting actionable negligence in the complaint, including the failure to install a protective guardrail at the accident site.2
The state moved for partial summary judgment, claiming that its admitted failure to install a protective guardrail at the location in question was the product of discretionary decisions by state agents. In support of its motion the state submitted the sworn affidavits of DeVerl Peterson, a traffic and safety engineer with the Department of Transportation. According to Peterson, the original project proposal included a number of guardrails that were excluded in the final plan because of funding constraints.
Industrial Indemnity opposed the motion. It submitted evidence indicating that the original proposal called for installation of a guardrail in the area of the accident and that various highway officials had agreed that the suggested installations were appropriate. Industrial Indemnity also submitted a letter from a federal highway official stating that the Glenn Highway guardrail project had been handled in an abnormal fashion. Following oral argument, the superior court granted the state’s motion. Industrial Indemnity appeals.3
The State of Alaska created a cause of action for contract and tort claims against the state in the Alaska Tort Claims Act of 1962. AS 09.50.250-300. In the area of tort suits, however, the state did not grant a cause of action for claims arising out of “the exercise or performance or the failure to exercise or perform a discretionary function or duty on the part of a state agency or an employee of the state, whether or not the discretion involved is abused .... ” AS 09.50.250(1).4 We have termed this statuto[563]*563ry immunity the “discretionary function exception” of the tort claims act.
The state contends that it is entitled to immunity for its failure to place a guardrail at the site of John Richey’s accident under the discretionary function exception of AS 09.50.250(1). We agree.
We have held that the discretionary function exception applies to government decisions entailing planning or policy formation. Wainscott v. State, 642 P.2d 1355, 1356 (Alaska 1982); Japan Air Lines Co. v. State, 628 P.2d 934, 936 (Alaska 1981); State v. I’Anson, 529 P.2d 188, 193-94 (Alaska 1974). In suits brought under the tort claims act, we have employed a “planning level-operational level” test to distinguish between decisions involving the formulation of basic policy, entitled to immunity, and decisions regarding only the execution or implementation of that policy, not entitled to immunity. Rapp v. State, 648 P.2d 110 (Alaska 1982); Wainscott, 642 P.2d at 1356-57; Japan Air Lines, 628 P.2d at 936; Jennings v. State, 566 P.2d 1304, 1311 (Alaska 1977); I'Anson, 529 P.2d at 193; State v. Abbott, 498 P.2d 712, 721 (Alaska 1972).
The planning level-operational level test must be applied in consideration of the policies underlying the discretionary function exception of Alaska’s Tort Claims Act. I'Anson, 529 P.2d at 193 (Alaska 1974); Abbott, 498 P.2d at 721. See Wainscott, 642 P.2d at 1356. The principal policy underlying the tort immunity is to limit judicial re-examination of decisions properly entrusted to other branches of government. Wainscott, 642 P.2d at 1356; Japan Air Lines, 628 P.2d at 936; I'Anson, 529 P.2d at 193. See also Johnson v. State, 69 Cal.2d 782, 73 Cal.Rptr. 240, 447 P.2d 352, 360 (1968) (en banc). The courts will refrain from second-guessing the legislative and executive branches on issues of basic policy. Under our system of separation of powers, such decisions are vested in the politically responsive coordinate branches. Thus, in applying the test for discretionary function immunity under AS 09.50.250, we will “isolate those decisions sufficiently sensitive so as to justify judicial abstention.” Wainscott, 642 P.2d at 1356.
In addition, courts must not intrude into realms of policy exceeding their institutional competence. The judicial branch lacks the fact-finding ability of the legislature, and the special expertise of the executive departments. We have consistently held that the courts of Alaska should not attempt to balance the detailed and competing elements of legislative or executive decisions. Wainscott, 642 P.2d at 1356; I'Anson, 529 P.2d at 193 n. 20; Abbott, 498 P.2d at 721. See Reynolds, The Discretionary Function Exception of the Federal Tort Claims Act, 57 Geo.L.J. 81, 121-23, 128-31 (1968); Jaffe, Suits Against Governments and Officers: Damage Actions, 77 Harv.L.Rev. 209, 235-36 (1963).
Turning to the case at hand, the superior court rested its ruling on the ground that the state had never decided to install a guardrail at Long Lake Hill. The court reasoned that the question of whether or not to install a guardrail at the accident site was one of policy,5 and that an affirmative decision to go ahead with the installation had to be made at the discretionary level in order to advance the chain of events to the operational stage.6 We agree with both parts of the superior court’s analysis.
[564]*564In our recent decisions in Rapp v. State, 648 P.2d 110 (Alaska 1982), and Wainscott v. State, 642 P.2d 1355 (Alaska 1982), this court held that the state’s failure to install sequential traffic signals at two intersections were planning-level decisions immune from negligence liability. In Wainscott, we observed that:
There are undoubtedly numerous intersections throughout the state where known traffic hazards could be significantly reduced by the installation of more sophisticated traffic control devices. Available funding, however, requires that the Department of Transportation select among these locations in deciding where to make improvements ....
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[562]*562OPINION
RABINO WITZ, Justice.
On January 2, 1977, while acting in the scope of his employment, John Richey was killed when his vehicle left the road near Long Lake at Mile 86.4 of the Glenn Highway. Industrial Indemnity Company of Alaska paid workers’ compensation benefits to Richey’s wife and brought this action against the State of Alaska under AS 23.-30.0151 and the Alaska Tort Claims Act, AS 09.50.250-.300.
The complaint alleged that the state’s negligence was the proximate cause of Ri-chey’s death. Various specific acts and omissions were referred to as constituting actionable negligence in the complaint, including the failure to install a protective guardrail at the accident site.2
The state moved for partial summary judgment, claiming that its admitted failure to install a protective guardrail at the location in question was the product of discretionary decisions by state agents. In support of its motion the state submitted the sworn affidavits of DeVerl Peterson, a traffic and safety engineer with the Department of Transportation. According to Peterson, the original project proposal included a number of guardrails that were excluded in the final plan because of funding constraints.
Industrial Indemnity opposed the motion. It submitted evidence indicating that the original proposal called for installation of a guardrail in the area of the accident and that various highway officials had agreed that the suggested installations were appropriate. Industrial Indemnity also submitted a letter from a federal highway official stating that the Glenn Highway guardrail project had been handled in an abnormal fashion. Following oral argument, the superior court granted the state’s motion. Industrial Indemnity appeals.3
The State of Alaska created a cause of action for contract and tort claims against the state in the Alaska Tort Claims Act of 1962. AS 09.50.250-300. In the area of tort suits, however, the state did not grant a cause of action for claims arising out of “the exercise or performance or the failure to exercise or perform a discretionary function or duty on the part of a state agency or an employee of the state, whether or not the discretion involved is abused .... ” AS 09.50.250(1).4 We have termed this statuto[563]*563ry immunity the “discretionary function exception” of the tort claims act.
The state contends that it is entitled to immunity for its failure to place a guardrail at the site of John Richey’s accident under the discretionary function exception of AS 09.50.250(1). We agree.
We have held that the discretionary function exception applies to government decisions entailing planning or policy formation. Wainscott v. State, 642 P.2d 1355, 1356 (Alaska 1982); Japan Air Lines Co. v. State, 628 P.2d 934, 936 (Alaska 1981); State v. I’Anson, 529 P.2d 188, 193-94 (Alaska 1974). In suits brought under the tort claims act, we have employed a “planning level-operational level” test to distinguish between decisions involving the formulation of basic policy, entitled to immunity, and decisions regarding only the execution or implementation of that policy, not entitled to immunity. Rapp v. State, 648 P.2d 110 (Alaska 1982); Wainscott, 642 P.2d at 1356-57; Japan Air Lines, 628 P.2d at 936; Jennings v. State, 566 P.2d 1304, 1311 (Alaska 1977); I'Anson, 529 P.2d at 193; State v. Abbott, 498 P.2d 712, 721 (Alaska 1972).
The planning level-operational level test must be applied in consideration of the policies underlying the discretionary function exception of Alaska’s Tort Claims Act. I'Anson, 529 P.2d at 193 (Alaska 1974); Abbott, 498 P.2d at 721. See Wainscott, 642 P.2d at 1356. The principal policy underlying the tort immunity is to limit judicial re-examination of decisions properly entrusted to other branches of government. Wainscott, 642 P.2d at 1356; Japan Air Lines, 628 P.2d at 936; I'Anson, 529 P.2d at 193. See also Johnson v. State, 69 Cal.2d 782, 73 Cal.Rptr. 240, 447 P.2d 352, 360 (1968) (en banc). The courts will refrain from second-guessing the legislative and executive branches on issues of basic policy. Under our system of separation of powers, such decisions are vested in the politically responsive coordinate branches. Thus, in applying the test for discretionary function immunity under AS 09.50.250, we will “isolate those decisions sufficiently sensitive so as to justify judicial abstention.” Wainscott, 642 P.2d at 1356.
In addition, courts must not intrude into realms of policy exceeding their institutional competence. The judicial branch lacks the fact-finding ability of the legislature, and the special expertise of the executive departments. We have consistently held that the courts of Alaska should not attempt to balance the detailed and competing elements of legislative or executive decisions. Wainscott, 642 P.2d at 1356; I'Anson, 529 P.2d at 193 n. 20; Abbott, 498 P.2d at 721. See Reynolds, The Discretionary Function Exception of the Federal Tort Claims Act, 57 Geo.L.J. 81, 121-23, 128-31 (1968); Jaffe, Suits Against Governments and Officers: Damage Actions, 77 Harv.L.Rev. 209, 235-36 (1963).
Turning to the case at hand, the superior court rested its ruling on the ground that the state had never decided to install a guardrail at Long Lake Hill. The court reasoned that the question of whether or not to install a guardrail at the accident site was one of policy,5 and that an affirmative decision to go ahead with the installation had to be made at the discretionary level in order to advance the chain of events to the operational stage.6 We agree with both parts of the superior court’s analysis.
[564]*564In our recent decisions in Rapp v. State, 648 P.2d 110 (Alaska 1982), and Wainscott v. State, 642 P.2d 1355 (Alaska 1982), this court held that the state’s failure to install sequential traffic signals at two intersections were planning-level decisions immune from negligence liability. In Wainscott, we observed that:
There are undoubtedly numerous intersections throughout the state where known traffic hazards could be significantly reduced by the installation of more sophisticated traffic control devices. Available funding, however, requires that the Department of Transportation select among these locations in deciding where to make improvements ....
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If we were to assess the propriety of this decision, we would be engaging in just the type of judicial review that the discretionary function exception seeks to prevent. The selection of a traffic control device for the New Seward — O’Mal-ley intersection was not a purely ministerial decision implementing a preexisting policy, but rather a decision that called for policy judgment and the exercise of discretion.
642 P.2d at 1357. Accord, Rapp, 648 P.2d at 110; Jennings, 566 P.2d at 1311-12. We think that the state’s failure to install a guardrail at mile post 86.4 of the Glenn Highway is analogous to its failure to place traffic signals at the intersections in Rapp and Wainscott. Both types of decisions involve planning, an assessment of competing priorities, and a weighing of budgetary considerations.7 There is no dispute that the proposed Glenn Highway guardrail installations were cut back because of a lack of funding from the Department of Transportation.8 Decisions regarding the allocation [565]*565of scarce resources are usually discretionary, and thus immune from judicial inquiry. Wainscott, 642 P.2d at 1357 n. 6. See Bearce v. United States, 614 F.2d 556, 561 (7th Cir.1980), cert. denied, 449 U.S. 837, 101 S.Ct. 112, 66 L.Ed.2d 44 (1980).9 The state produced a calculation that to install a guardrail at Long Lake Hill would now cost at least $425,000.00. DeVerl Peterson, Department of Transportation Traffic and Safety Engineer for the Central Region, stated in his first affidavit that “this particular mile and one-half stretch of the Glenn Highway is not unique and that the installation of guardrails on similar sections of highway on the Glenn Highway alone would require the expenditure of several tens of millions of dollars.” There is a factual dispute concerning the state’s figures, and Industrial Indemnity maintains that the cost of guardrails in 1969 (when the Glenn Highway project was first under consideration) was only one-fifth of the present-day estimates made by the state. Even resolving this question in a manner most favorable to Industrial Indemnity, it remains clear that guardrails are expensive, and that a decision by the state to place guardrails along the Glenn Highway would necessarily affect the state’s ability to provide other governmental services. We would be engaging in precisely the type of policy evaluation that the discretionary function exception is designed to foreclose if we were to inquire into the wisdom of the state’s guardrail policy in this case.
Although the foregoing discussion is adequate to dispose of the case at bar, appellant raises an additional argument that warrants comment. Industrial Indemnity does not claim that an affirmative decision was ever made to place a guardrail at Long Lake Hill. It maintains, however, that the state undertook to carry out a “guardrail project” on the Glenn Highway, that the state commissioned engineers to determine where guardrail installations would be appropriate, that these engineers formulated a project proposal based upon empirical warrant standards, and that the state did build many of the guardrails as recommended in the original project proposal. Industrial Indemnity claims that somewhere in this sequence of events the state assumed a duty to erect certain guardrails determined to be appropriate in the engineering survey.10 Once this duty was created, the ultimate decision of where to place individual guardrails was made by project engineers, who had to choose among the proposed installations due to incomplete funding. Industrial Indemnity argues that the engineers’ final selections were operational decisions made to implement the general policy of the guardrail project, and that the state may thus be held liable for their [566]*566determinations with respect to particular installations. A necessary extension of this argument is that the state is vulnerable to suit with respect to every site on the highway where the original project proposal called for a guardrail, but where no guardrail was ever installed. We think that Industrial Indemnity’s theory cannot co-exist with the rule of law that budgetary decisions are immune from suit under the discretionary function exception of the tort claims statute. The Department does not make decisions on a guardrail-by-guardrail basis, but the necessary consequence of its determination to allocate less money to the project was that fewer guardrails would be built. We do not think that a decision by the Department to fund only a portion of a proposed project renders the state vulnerable to lawsuits with respect to every proposal not carried out. This would be the result of allowing private individuals to claim that specific omissions were the product of improper decision-making. We therefore hold that, once it is determined that the decision at issue is of the type entrusted to the planning level of government, a claimant must show that an affirmative assumption of duty has been made by the state in order to have a claim for relief for alleged operational negligence in performing that duty.11
We conclude that the decision whether or not to build a guardrail at the site of John Richey’s accident on the Glenn Highway was within the ambit of the discretionary function exception of AS 09.50.250(1). Thus, the decision below granting summary judgment to the State of Alaska is AFFIRMED.