Williams, J.
(to affirm). This case concerns government immunity from liability for tort.1 Such immunity may arise either from judicial policy or [8]*8legislation. This case does not involve judicially created but rather legislatively created immunity.
On appeal the question raised by the Court of Claims grant of summary judgment is whether the facts pled in this case, the death of an employee of a subcontractor who was engaged in the construction of a state highway when he was killed by falling earth when tunneling under a railroad right-of-way, deal with a "case[s] wherein the government agency is engaged in the exercise or discharge of a governmental function” as provided by statute. 2
We hold that the facts as pled deal with a "case[s] wherein the government agency is engaged in the exercise or discharge of a governmental function” as defined by common-law precedent at the time of the enactment of the pertinent governmental immunity statute and affirm the Court of Appeals.
I — Governmental Immunity Statute
The legislative provision for governmental immunity is contained in MCLA 691.1407; MSA 3.996(107). This section provides:
"Except as in this act otherwise provided, all government agencies shall be immune from tort liability in all cases wherein the government agency is engaged in the [9]*9exercise or discharge of a governmental function. Except as otherwise provided herein, this act shall not be construed as modifying or restricting the immunity of the state from tort liability as it existed heretofore, which immunity is affirmed.” (Emphasis added.)
To this general grant of immunity the Legislature has enacted certain exceptions3 none of which here is applicable.
The key to determining the applicability of the immunity defense is in ascertaining whether or not the particular case is one "wherein the * * * agency is engaged in the exercise or discharge of a governmental function”.
The term "governmental function” is nowhere defined in the statute. However, this does not mean that we have been left with no guidelines in determining what the Legislature intended by adopting this particular phraseology.
"Governmental function” is a term of art which has been used by the courts of this state to describe those activities of government which due to their public nature should not give rise to liability at common law. Through many years of application, the label of governmental function has been attached to a number of governmental activities.
Words and phrases which have acquired meaning in the common law are interpreted as having the same meaning when used in statutes dealing with the same subject matter as that which they were associated at the common law. 2A Sutherland Statutory Construction (3d ed, Sands), § 50.03, [10]*10pp 277-278. See People v Den Uyl, 320 Mich 477, 486; 31 NW2d 699 (1948).
It is therefore reasonable to conclude that the Legislature, in choosing the precise terminology of "governmental function” to describe the limits of governmental immunity, intended that activities described as governmental functions at common law at the time of enactment of the new legislation would enjoy statutory immunity from tort liability.
The historical context in which the governmental. immunity statute was enacted suggests that the Legislature, alarmed at the prospects of liability for government activities previously protected, sought to restore the immunity enjoyed by municipalities prior to Williams v Detroit, 364 Mich 231; 111 NW2d 1 (1961), and to codify the state’s existing immunity to insulate governmental entities from tort liability.4
The Legislature accomplished this goal by employing a term, "governmental function”, which served to mark the boundaries of common-law immunity, and used it to set the limits of statutory immunity.
This conclusion is supported by the language employed in MCLA 691.1407; MSA 3.996(107). This section provides in pertinent part:
"Except as otherwise provided herein, this act shall not be construed as modifying or restricting the immu[11]*11nity of the state from tort liability as it existed heretofore, which immunity is affirmed.”5
Obviously this language must be construed as an "affirmation” of case-law precedent on the subject of the state’s immunity.
II — State Was Engaged in a "Governmental Function”
Given that the Legislature intended activities regarded as governmental functions under common law should be considered governmental functions under the statute, the question becomes whether under the facts the Department of State Highways at the time of decedent’s fatal injury was engaged in the exercise or discharge of a "governmental function” under common-law immunity.
The question whether or not a government agency was engaged in a governmental function will not always be easily answered. In many instances governmental activities have never been examined in terms of whether they constitute governmental function and in others the case-law precedent is less than clear. In those cases the courts will be forced to adapt case-law precedent as best they can and will no doubt be called upon to use their own creative genius to resolve the case. However, in this case, prior court decisions have clearly established that the activity involved —the maintenance and improvement of a highway —is a governmental function.
[12]*12In Gunther v Board of County Road Commissioners of Cheboygan County, 225 Mich 619, 631; 196 NW 386 (1923), this Court held:
"Our former decisions as well as the great weight of authority sustain the contention of defendants’ counsel and the holding of the trial judge that in this work [maintenance and repair of highways] the counties are discharging a governmental function and in the absence of statute are immune from liability for their negligence or that of their agent in carrying on this work.”
See In re Claim of Moross, 242 Mich 277, 281; 218 NW 683, cert den 278 US 635; 49 S Ct 32; 73 L Ed 552 (1928) ["construction, maintenance and repair of a highway are governmental function”] and Johnson v Board of County Road Commissioners of Ontonagon County, 253 Mich 465, 468; 235 NW 221 (1931).6
Confronted by the uniformity and clarity with which prior case law has treated the repair, maintenance and construction of highways as a governmental function it is difficult to conclude other than that the activity involved in this case must be regarded as a governmental function under the statute and that as a result the defense of governmental immunity is available to the State Highway Department.7
Ill — Conclusion
The result reached in this decision is the result [13]*13mandated by the governmental immunity statute as it presently exists.
This statute is not as precise or pervasive as it could be.
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Williams, J.
(to affirm). This case concerns government immunity from liability for tort.1 Such immunity may arise either from judicial policy or [8]*8legislation. This case does not involve judicially created but rather legislatively created immunity.
On appeal the question raised by the Court of Claims grant of summary judgment is whether the facts pled in this case, the death of an employee of a subcontractor who was engaged in the construction of a state highway when he was killed by falling earth when tunneling under a railroad right-of-way, deal with a "case[s] wherein the government agency is engaged in the exercise or discharge of a governmental function” as provided by statute. 2
We hold that the facts as pled deal with a "case[s] wherein the government agency is engaged in the exercise or discharge of a governmental function” as defined by common-law precedent at the time of the enactment of the pertinent governmental immunity statute and affirm the Court of Appeals.
I — Governmental Immunity Statute
The legislative provision for governmental immunity is contained in MCLA 691.1407; MSA 3.996(107). This section provides:
"Except as in this act otherwise provided, all government agencies shall be immune from tort liability in all cases wherein the government agency is engaged in the [9]*9exercise or discharge of a governmental function. Except as otherwise provided herein, this act shall not be construed as modifying or restricting the immunity of the state from tort liability as it existed heretofore, which immunity is affirmed.” (Emphasis added.)
To this general grant of immunity the Legislature has enacted certain exceptions3 none of which here is applicable.
The key to determining the applicability of the immunity defense is in ascertaining whether or not the particular case is one "wherein the * * * agency is engaged in the exercise or discharge of a governmental function”.
The term "governmental function” is nowhere defined in the statute. However, this does not mean that we have been left with no guidelines in determining what the Legislature intended by adopting this particular phraseology.
"Governmental function” is a term of art which has been used by the courts of this state to describe those activities of government which due to their public nature should not give rise to liability at common law. Through many years of application, the label of governmental function has been attached to a number of governmental activities.
Words and phrases which have acquired meaning in the common law are interpreted as having the same meaning when used in statutes dealing with the same subject matter as that which they were associated at the common law. 2A Sutherland Statutory Construction (3d ed, Sands), § 50.03, [10]*10pp 277-278. See People v Den Uyl, 320 Mich 477, 486; 31 NW2d 699 (1948).
It is therefore reasonable to conclude that the Legislature, in choosing the precise terminology of "governmental function” to describe the limits of governmental immunity, intended that activities described as governmental functions at common law at the time of enactment of the new legislation would enjoy statutory immunity from tort liability.
The historical context in which the governmental. immunity statute was enacted suggests that the Legislature, alarmed at the prospects of liability for government activities previously protected, sought to restore the immunity enjoyed by municipalities prior to Williams v Detroit, 364 Mich 231; 111 NW2d 1 (1961), and to codify the state’s existing immunity to insulate governmental entities from tort liability.4
The Legislature accomplished this goal by employing a term, "governmental function”, which served to mark the boundaries of common-law immunity, and used it to set the limits of statutory immunity.
This conclusion is supported by the language employed in MCLA 691.1407; MSA 3.996(107). This section provides in pertinent part:
"Except as otherwise provided herein, this act shall not be construed as modifying or restricting the immu[11]*11nity of the state from tort liability as it existed heretofore, which immunity is affirmed.”5
Obviously this language must be construed as an "affirmation” of case-law precedent on the subject of the state’s immunity.
II — State Was Engaged in a "Governmental Function”
Given that the Legislature intended activities regarded as governmental functions under common law should be considered governmental functions under the statute, the question becomes whether under the facts the Department of State Highways at the time of decedent’s fatal injury was engaged in the exercise or discharge of a "governmental function” under common-law immunity.
The question whether or not a government agency was engaged in a governmental function will not always be easily answered. In many instances governmental activities have never been examined in terms of whether they constitute governmental function and in others the case-law precedent is less than clear. In those cases the courts will be forced to adapt case-law precedent as best they can and will no doubt be called upon to use their own creative genius to resolve the case. However, in this case, prior court decisions have clearly established that the activity involved —the maintenance and improvement of a highway —is a governmental function.
[12]*12In Gunther v Board of County Road Commissioners of Cheboygan County, 225 Mich 619, 631; 196 NW 386 (1923), this Court held:
"Our former decisions as well as the great weight of authority sustain the contention of defendants’ counsel and the holding of the trial judge that in this work [maintenance and repair of highways] the counties are discharging a governmental function and in the absence of statute are immune from liability for their negligence or that of their agent in carrying on this work.”
See In re Claim of Moross, 242 Mich 277, 281; 218 NW 683, cert den 278 US 635; 49 S Ct 32; 73 L Ed 552 (1928) ["construction, maintenance and repair of a highway are governmental function”] and Johnson v Board of County Road Commissioners of Ontonagon County, 253 Mich 465, 468; 235 NW 221 (1931).6
Confronted by the uniformity and clarity with which prior case law has treated the repair, maintenance and construction of highways as a governmental function it is difficult to conclude other than that the activity involved in this case must be regarded as a governmental function under the statute and that as a result the defense of governmental immunity is available to the State Highway Department.7
Ill — Conclusion
The result reached in this decision is the result [13]*13mandated by the governmental immunity statute as it presently exists.
This statute is not as precise or pervasive as it could be. The practical effect of the Legislature’s decision to establish governmental immunity in the manner it has chosen is to return much of the task of determining the limits of governmental immunity to the courts. Under the present statutory scheme the judiciary, looking to past precedents (which in many cases are less than clear), must decide on a case-by-case basis which activities may be classified as governmental functions and thus entitled to immunity. Until such judicial decisions are made, which may not be until a number of years have passed, those who must try to live with this statute will encounter many areas of doubt as to whether a given activity is or is not a governmental function. Such confusion could be more quickly relieved by more specific legislative guidelines.8
Under the guise of "judicial refinement,” the Kavanagh/Fitzgerald opinion has sought to impose rather novel standards for governmental immunity. For example, the opinion suggests that if a police commission plans a particular type of war on crime, that is a governmental function, but if a [14]*14police officer under that plan performs the traditional police function of arresting a criminal, that is not a governmental function.9 This certainly does not in any way correspond to the meaning the Legislature intended.
Under the governmental immunity statute as it presently is constituted, the common law and common sense indicate that the state was engaged in a governmental function at the time decedent was fatally injured and thus the state is entitled to raise the defense of governmental immunity until the Legislature enacts a governmental immunity law holding otherwise.
The Court of Appeals is affirmed. No costs, a public question.
Coleman, Lindemer, and Ryan, JJ., concurred with Williams, J.
Kavanagh, C. J., and Fitzgerald, J.
Plaintiffs’ decedent, an employee of a subcontractor, was engaged in the construction of a state highway [15]*15when he was killed by falling earth when tunneling under a railroad right-of-way. This action was originally brought in the Court of Claims alleging, inter alia, negligence of the State Highway Department.1 Summary judgment was entered for the defendant. That judgment was affirmed by the Court of Appeals.
On appeal to this Court, plaintiffs raise three issues. Only the third issue deals with the constitutionality and construction of the governmental immunity act, 1964 PA 170; MCLA 691.1401 et seq.; MSA 3.996(101) et seq.2 We conclude that in this case, on the basis of the statutory language, the state is not immunized from liability. We do not reach the other issues raised as they are not ripe for appellate resolution.
In their complaint plaintiffs contended that defendant was negligent in failing to 'supervise the [16]*16digging out of the dirt beneath the Grand Trunk Railroad viaduct’, enumerating six instances of such negligence. Defendant did not file an answer but rather immediately filed a motion for summary judgment. In this motion defendant asserted that plaintiffs had 'failed to state a claim upon which relief can be granted’, pointing to the fact that plaintiffs’ decedent was an employee of a subcontractor and not under the supervision and control of defendant. At the hearing on defendant’s motion for summary judgment, defendant relied upon both governmental immunity and the asserted fact that defendant had no control or supervisory authority over plaintiffs’ decedent. The trial court apparently granted summary judgment on both bases. The Court of Appeals resolved the case in favor of defendant on the basis of governmental immunity.
On appeal before this Court, defendant again urges that summary judgment was appropriate because defendant had no control or supervision of the tunneling operation in which plaintiffs’ decedent was killed. Plaintiffs also argue, for the first time on appeal, that defendant breached a statutory duty to supervise and control the tunneling operation and also that the tunneling operation was such 'inherently dangerous’ activity as would give rise to a legal duty on defendant’s part to supervise and control the tunneling operation.
There has been no factual development in this case. Had the grant of summary judgment been premised alone on resolution of these issues we would have been obliged to reverse because these issues, being factual disputes, do not admit of summary disposition. They must be fully developed and determined at a trial.
In Williams v Detroit, 364 Mich 231, 250; 111 [17]*17NW2d 1 (1961), four members of an eight-person Court, speaking through Justice (now Judge) Edwards, stated:
"From this date forward the judicial doctrine of governmental immunity from ordinary torts no longer exists in Michigan.”3
The Legislature subsequently enacted 1964 PA 170. That statute, as amended by 1970 PA 155, now reads, at § 7:
"Except as in this act otherwise provided, all governmental agencies shall be immune from tort liability in all cases wherein the government agency is engaged in the exercise or discharge of a governmental function. Except as otherwise provided herein, this act shall not be construed as modifying or restricting the immunity of the state from tort liability as it existed heretofore, which immunity is affirmed.” (Emphasis supplied.) (Compiled as MCLA 691.1407; MSA 3.996[107].)4
The state’s governmental function immunity of § 7 does not apply to any action "arising out of the [18]*18[state’s] performance of a proprietary function” defined as "any activity which is conducted primarily for the purpose of producing a pecuniary profit for the state, excluding, however, any activity normally supported by taxes or fees”. MCLA 691.1413; MSA 3.996(113).
In contrast with this specific definition of "proprietary function”, the act does not define "exercise or discharge of a governmental function”. Because "exercise or discharge of a governmental function” has no fixed meaning, and is not defined in the statute, the phrase is "presumably subject to judicial refinement”.5 This fact would seem evident because the term governmental function is historically of judicial origin.6 We perceive in this lack of a precise legislative definition an intention to leave to the judiciary the task of defining a somewhat amorphous concept in concrete factual settings. The question in the instant case, therefore, becomes one of statutory interpretation: Was the State of Michigan, by contracting out work on a highway construction project, engaged in the exercise or discharge of a governmental function, thus immunizing it from tort liability? We hold that it was not so engaged, and thus is not immune.
A broad definition of "exercise or discharge of a governmental function” would leave that phrase without any meaning of substance in the context of the governmental tort immunity act.7 As the [19]*19scope of governmental activity increases, the government performs many services that are not essentially "governmental”. The legislative grant of tort immunity does not extend to these governmental activities. "[T]here is nothing governmental about the activities of a doctor employed on the staff of a public, rather than a private hospital, nor about the activities of a worker employed on a street project, rather than on building a private driveway for a private employer.”8
If "governmental function” were deemed to insu[20]*20late all governmental activities for which liability is not expressly provided in the statute, the phrase would not describe the nature of the activity involved, and would not only be irreconcilable with the historical tradition of governmental responsibility, but in fact governmental irresponsibility would be fostered if "governmental function” were simply equated with "governmental participation”, and the victims’ right to recovery depended solely upon the identity of the tortfeasor rather than on the nature of the function being performed. The policy reasons which motivated the Legislature to institute governmental immunity cannot be given such an irrational interpretation.9
Mr. Justice Jackson, dissenting in Dalehite v United States, 346 US 15, 57; 73 S Ct 956; 97 L Ed 1427 (1953), succinctly stated the policy basis and practical necessity of governmental immunity: "[I]t is not a tort for government to govern”. That is also the essence of the Michigan governmental immunity statute. Exposure to liability necessitating judicial inquiry into the essential workings of all branches of government is unacceptable in our constitutional system. Professor Kenneth Culp Davis notes the "utter impracticality” of trying to make governmental units liable in damages for all the harm they do the interests of individuals and corporations:
[21]*21"A city should not be liable for damages done by a zoning ordinance, which necessarily reduces the value of some property. Nor should the state be liable to the seller of a harmful drug if it enacts a statute prohibiting further sale of the drug, thereby destroying a profitable business.” 3 Davis, Administrative Law Treatise, § 25.11, p 484.
The test then, of "governmental function” for purposes of the immunity statute, must be phrased in terms of the nature of the specific function. We conclude that a function is not "governmental” in this context unless the particular activity that this function entails is uniquely associated with those activities having "no common analogy in the private sector because they reflect the imperative element in government, the implementation of its right and duty to govern”.10 Thus, a government is immune only when it is planning and carrying out duties which, due to their peculiar nature, can only be done by a government. The mere fact that a governmental agency is doing a certain act does not make such act a "governmental function” if a private person or corporation may undertake the same act. Thus, "governmental function” is not delineated by questions of the broad scope of an activity undertaken or by financial or insurance considerations which may be indicative of a governmental undertaking, but rather by viewing the precise action allegedly giving rise to liability, and determining whether such action is sui generis governmental — of essence to governing. Supervision of road construction (as opposed to the making of decisions as to whether to build a road), operation of hospitals and schools (as opposed to planning or deciding what health services to offer [22]*22or what subject to teach), operation and supervision of playgrounds and swimming pools (as opposed to deciding whether to operate such playgrounds or pools) are not governmental functions within this definition.11 On the other hand, certain aspects of the exercise of the executive, legislative, or judicial powers are by their very nature governmental functions and necessarily removed from the undertakings of the private sector. In this regard, we agree with the California Law Revision Commission:
"Decisions of legislators to enact or not to enact legislation; decisions of prosecutors to prosecute or not to prosecute persons suspected of crime; decisions of judges to grant or not to grant judgment for a particular party — these and other comparable types of governmental activity are examples of the kinds of functions which imperatively require complete independence from threat of tort consequences to insure their fearless and objective performance.” 5 Cal Law Revision Comm Report, Recommendations and Studies, 281, 282 (1963).
The parameter of "governmental function” will most often run along the line of distinction between decisional and planning aspects of governmental duties on the one hand, and operational aspects on the other. See 3 Davis, Administrative Law Treatise, § 25.10, pp 476-482.12 In this case, [23]*23where an operational aspect of the governmental road-building activity is involved, we find no governmental immunity because no exercise or discharge of a governmental function was involved in the act alleged to have been negligently performed, i.e., supervision of a digging operation on a highway construction project.
The analysis is similar to that of the United States Court of Appeals for the District of Columbia in Elgin v District of Columbia, 119 US App DC 116, 118; 337 F2d 152, 154 (1964):
"With kings replaced by city councils as the embodiments of the grace by which men permit themselves to be governed, this alertness was verbalized in somewhat different terms, but the core of the judicial insight remained the same. It is, we believe, essentially this: If a king, or a city council, is to do the job of governing well, then there is something to be said for withholding the threat of answerability in damages for at least some of the actions and decisions which governing necessarily entails. He who rules must make choices among competing courses of action and in the face of conflicting considerations of policy. The capacity and the incentive to govern effectively are arguably not enhanced by the [24]*24prospect of being sued by those citizens who may be adversely affected by the choice eventually made. Thus it has been thought wise to sweep this restrictive cloud from the horizon and to let those responsible for the conduct of public affairs calculate their courses of action free of this intimidating influence. By the same token, in those areas of governmental action where the reason for the rule does not apply, the rule itself is disregarded.”
In Spencer v General Hospital of the District of Columbia, 138 US App DC 48, 57-58; 425 F2d 479, 488 (1969) (Wright, J., concurring), the opinion in Elgin, supra, was discussed in a manner which has application to our focus on the nature of the particular activity being performed by the governmental agency in determining whether immunity exists:
"Drawing on two recent cases, the court discerned a shift from a 'governmental-proprietary’ to a 'discretionary-ministerial’ distinction. Where the previous distinction had rested on a vertical classification of broad areas of activity — education, sanitation, care of the sick, etc. — as 'governmental’ or 'proprietary,’ the new distinction was a horizontal one which cut across these broad areas, and looked with more particularity at the act or omission complained of as negligent. Where the injury proximately resulted from a deliberate choice in the formulation of official policy, characterized by a high 'degree of discretion and judgment involved in the particular governmental act’, immunity would remain. To inquire into such decisions in a tort suit might 'jeopardiz[e] the quality and efficiency of government itself,’ and endanger the creative exercise of political discretion and judgment through 'the inhibiting influence of potential legal liability asserted with the advantage of hindsight.’ On the other hand, where the injury was inflicted by negligent official acts or omissions other than in the formulation of public policy — 'ministerial acts’ — liability could be asserted. Thus in 'the execution [25]*25of policy as distinct from its formulation,’ the District of Columbia could be held to the duty of reasonable care which the courts had long enforced against individuals and private associations.” (Footnotes omitted.)
Our holding that the State of Michigan is not immune in this case under § 7 of the governmental immunity act in no way addresses the actual merits concerning the alleged negligence of the state. All we hold is that the governmental tort immunity act does not here bar suit against the state.
Reversed and remanded. No costs, a public question.
Levin, J., concurred with Kavanagh, C. J., and Fitzgerald, J.