THE HONORABLE JAN GOLDSMITH, MEMBER OF THE CALIFORNIA ASSEMBLY, has requested an opinion on the following question:

May a city prohibit the making of turns onto designated public streets in either business or residential areas within its jurisdiction during selected hours when no traffic safety issue is involved?

A city may prohibit the making of turns onto designated public streets in either business or residential areas within its jurisdiction during selected hours when no traffic safety issue is involved.

A city possesses and may exercise only such powers as are granted to it by the Constitution or by state statutes, together with those powers that arise by necessary implication from those expressly granted. (Myers v. City Council of Pismo Beach (1966) 241 Cal.App.2d 237, 240; 76 Ops.Cal.Atty.Gen. 289, 291 (1993).) In A&B Cattle Co. v. City of Escondido (1987) 192 Cal.App.3d 1032, 1038, the court summarized the following principles of municipal powers that we find to be applicable to the question presented:

"'Under the police power granted by the Constitution, counties and cities have plenary authority to govern, subject only to the limitation that they exercise this power within their territorial limits and subordinate to state law.' [Citation.] More specifically, article XI, section 7 of the California Constitution provides: 'A county or city may make and enforce within its limits all local, police, sanitary, and other ordinances and regulations not in conflict with general laws.' Where local legislation conflicts with general law, it is void. [Citations.] 'Apart from this limitation, the "police power [of a county or city] under this provision . . . is as broad as the police power exercisable by the Legislature itself."' [Citations.]

"A local legislative enactment will be invalidated when it duplicates, contradicts, or infringes upon an area completely occupied by general law, either expressly or by legislative implication. Moreover, where the subject matter of the local legislation has been entirely occupied by state general law, supplementary or complementary legislation, even pertaining to matters otherwise properly characterized as municipal in character, is prohibited. [Citations.]"

We are asked whether a city may prohibit the making of turns onto designated public streets in either business or residential areas during selected hours where no traffic safety issue is involved. Footnote No. 1 This inquiry presents two essential issues of law. First, would the ordinance prohibiting the making of turns onto designated streets for other than traffic safety considerations be in conflict with any state law? Second, would such an ordinance fall within a city's police power?

1. Consistency With State Law

Section 21 of the Vehicle Code Footnote No. 2 provides:

"Except as otherwise expressly provided, the provisions of this code are applicable and uniform throughout the state and in all counties and municipalities therein, and no local authority shall enact or enforce any ordinance on the matters covered by this code unless expressly authorized therein."

"As noted by the Attorney General: 'Regulating the use of the public roads and highways by whatever means is outside the "municipal affairs" constitutional grant of authority to chartered cities.' (68 Ops.Cal.Atty.Gen. 101, 102, fn. 2 (1985).) Moreover, citing section 21, Rumford, and Lafayette, among others, the Attorney General stated: 'Since the state has preempted the entire field of traffic control, any right of a local authority to interfere with the free flow of traffic . . . must be derived from an express delegation of authority from the Legislature.' . . . (75 Ops.Cal.Atty.Gen. 80, 81 (1992).) We agree."

Section 22101, subdivision (a) provides:

"The Department of Transportation or local authorities in respect to highways under their respective jurisdictions, may cause official traffic control devices to be placed or erected within or adjacent to intersections to regulate or prohibit turning movements at such intersections."

It is readily apparent from these statutory definitions that the Legislature has expressly authorized cities to prohibit the making of turns onto designated public streets in either business or residential areas during selected hours when no traffic safety issue is involved. We find nothing in subdivision (a) of section 22101 that would limit the exercise of such authority to traffic safety concerns to the exclusion of all other considerations. (See also §§ 22113, 21351.)

2. Scope of Municipal Police Power

As noted above, a city's constitutionally based police power is, while subordinate to general law, "as broad as the police power exercisable by the Legislature itself." (See Birkenfeld v. City of Berkeley, supra, 17 Cal.3d at 140.) The police power is not limited to safety concerns. (75 Ops.Cal.Atty.Gen. 239, 241 (1992).) In People v. K. Sakai Co. (1976) 56 Cal.App.3d 531, 535, the court explained:

"The police power has long been described as the inherent power of a body politic to enact and enforce laws for the promotion of the general welfare. [Citations.] It has been said that an 'attempt to define its reach or trace its outer limits is fruitless.' [Citation.] The scope of the police power changes with changing social and economic conditions. It is 'not a circumscribed prerogative, . . . but is elastic and . . . capable of expansion to meet existing conditions of modern life and thereby keep pace with the social, economic, moral, and intellectual evolution of the human race. . . .'"

"In its inception the police power was closely concerned with the preservation of the public peace, safety, morals, and health without specific regard for 'the general welfare.' The increasing complexity of our civilization and institutions later gave rise to cases wherein the promotion of the public welfare was held by the courts to be a legitimate object for the exercise of the police power. As our civic life has developed so has the definition of 'public welfare' until it has been held to embrace regulations 'to promote the economic welfare, public convenience and general prosperity of the community.'"

Accordingly, we have stated that "[t]he police power is the inherent authority of the state to enact and enforce laws for the promotion of the general welfare, including the economic welfare, public convenience and general prosperity of the community." (65 Ops.Cal.Atty.Gen. 267, 273 (1982).) Any such purpose, including for example the alleviation of noise or air pollution within a business area or residential community during certain periods of the day, would support the exercise by a city of its police power authority in regulating the making of turns onto designated public streets without regard to any specified traffic safety objectives.

We conclude that a city may prohibit the making of turns onto designated public streets in either business or residential areas within its jurisdiction during selected hours when no traffic safety issue is involved.