The District of Columbia (District) appeals from the trial court’s order denying its motion for judgment notwithstanding *228 the verdict or a new trial. Following a jury-trial of four consolidated negligence actions, which arose from an automobile accident, the trial court entered judgment against the District for 1350,00o. 1 The theory of liability on which appellees recovered was threefold: that the District had negligently (1) designed a barrier and ramp on the Southeast Freeway; (2) failed to improve them; and (3) failed to maintain them. On appeal, the District contends that it is immune from liability for its discretionary decisions respecting freeway design and priorities for improving highways. It also asserts that the evidence showed that the freeway was well maintained. We agrеe and accordingly reverse.
I
On July 2, 1978, appellees Carlton and Eddie Pace and Sherrye Calhoun, as well as John Dawson’s decedent Rolene Dawson, were traveling westward on the Southeast Freeway in the Paces’ automobile. An autоmobile operated by William Marin entered the Freeway from the Third Street ramp as appellees approached it. When Mr. Marin drove up the ramp, the car in front of him slowed down before entering the Freeway. Rather than slowing down behind that car, Mr. Marin drove through a guard area designed to prevent such entries, crossed two lanes of traffic, and hit the rear of the Paces’ automobile. The Paces’ car went out of control, struck another car, vaulted over a metal guardrail, and fell approximately forty feet to the street below.
Following this accident, appellees Pace and Calhoun sued both the driver and owner of the car that hit them, as well as the District, for personal injuries. Rolene Dawson was killed in the accident, and John Dawson, her personal representative, sued only the District, as the car owner’s insurer settled with him. Appellees contend that the bridge guardrail was designed in such a way as to have caused their аutomobile to vault over it upon impact. They further claimed that this problem became known to highway experts several years after the Freeway’s construction and that the District should have then redesigned the barrier. Regarding the Third Street rаmp, appellees asserted that it was too short and too close to the exit ramp to the Capitol, thereby creating an unsafe condition.
Throughout the proceedings, the District maintained that its decisions concerning freewаy design and improvements are discretionary, but the trial court disagreed, instead instructing the jury that the District has a duty to maintain the streets in a reasonably safe condition. The court further instructed that in determining whether the District had met that duty, the jury could considеr the original design and subsequent maintenance of the Freeway.
II
The principles of sovereign immunity are well established in the District.
Rustin v. District of Columbia,
Ministerial acts are those which reflect “the execution of policy as distinct from its formulation.”
Elgin v. District of Columbia,
Applying these precepts to the facts at hand, we conclude that freeway planning and design are discretionary functions. The general principle of design immunity has been established in the District for close to a century.
See Johnston v. District of Columbia,
The District contends that decisions concerning not only freeway design but also freeway improvements are discretionary in nature. We agree. To hold otherwise would be effectively to impose a legal duty on the District to have “state-of-the-art” streets. Neither courts nor juries can dictate ad hoc policy in this aspect of government. The implementation of evolving engineering standards is costly, requiring the allocation of limited governmental funds through a system of priorities. Imposing a duty to implement the latest engineering standards would create a prohibitive burden on the District and its taxpayers. Further, long-term planning in this area is essential but would be thwarted entirely if it became the frequent subject of litigation.
The District’s decision on whether to establish a plan of improvement is within the area protected by sovereign immunity.
Wagshal v. District of Columbia, supra,
Ill
Finally, appellants claim that a directed verdict should have been granted on aрpel-lees’ claim of inadequate maintenance, as there was no evidence that the Freeway had been allowed to deteriorate. They aver that “[ajppellees’ allegations of improper maintenance were an impermissible recasting of their real claims concerning faulty design and failure to improve.”
We begin with the proposition that the District does have a ministerial duty to maintain its streets and highways.
See, e.g., Wagshal v. District of Columbia, supra,
We agree with the meaning that the District attaches to the word “maintain,” which is consistent with the dictionary’s definition — “to keep in a state of repair.” Webster’s New Internatiоnal Dictionary 1362 (1971). This view conforms to the Supreme Court’s language in
Johnston v. District of Columbia, supra,
Both the trial court and appellees place primary emphasis on language in
District of Columbia v. Caton,
Having adopted a plan and created an existing condition on the street in pursuance thereof, if it subsequently appears that the condition thus created renders the street unsafe, the District must go further and perform the duty cast upon it, to exercise ordinary care and take the necessary additional steps to make the street, thus encumbered with the product of its plan, reasonably safe for travel.
Id.
at 106. Despite the court’s use of broad language here, we do not believe that it сan be interpreted in the sweeping fashion which appellees advocate. To the contrary, the court specifically relied on and analogized to two earlier cases that defined “maintenance” in a narrower fаshion. In
Finney v. District of Columbia,
Later decisions by this court lend further support to our view that street maintenance means keeping the roadway and its physical appurtenаnces in good condition, according to their original design. For example, in
Wagshal v. District of Columbia, supra,
Mindful of our definition of maintenance, we have reviewed the record and agree with the District that appellees offered no evidence that the Freeway had been permitted to deteriorate from its original design. The only testimony concerning maintenance was that of the city’s expert, who stated that the pertinent parts of the Freewаy looked to be in “remarkably good condition.”
Accordingly, we reverse and order that judgment be entered in favor of the District of Columbia on all counts.
So ordered.
Notes
. The jury verdicts totaled $400,000, but the trial court gave the District a fifty percent credit on the $100,000 judgment in fаvor of John Dawson. The credit was based on a settlement with William Marin and Jay Mills, respectively the driver and owner of the automobile. Dawson appealed from the order granting the credit, and that appeal has been consolidated with those taken by the District. We need not reach the question of the credit, in view of our holding in favor of the District.
. Our holding is buttressed by the fact that the District has implemented a system to identify hazardous street locations and to set priorities among them for improvements. This system, which conforms to both local and federal requirements, produces an annual list of 200 locations for design modification. Ordinarily, funding is appropriated for work on the top 20 sites. The place where the accident in this case occurred was number 121 on the modification list *230 in 1976. The 1977 list had not been prepared at the time of the accident.
