All presumptions are in favor of legislative enactments, whether they flow from the legislative halls or from the electorate through the initiative process. State ex rel. Keyser Elrod v. Hallock, 14 Nev. 202 (1879); Ormsby County v. Kearney, 37 Nev. 314, 142 P. 803 (1914); State v. Com's. Humboldt Co., 21 Nev. 235, 29 P. 974 (1892); State v. Westerfield, 24 Nev. 29, 49 P. 554 (1897). In T. G.R.R. Co. v. Nev. Cal. T. Co., 58 Nev. 234, 75 P.2d 727 (1938), this court said: "There is no better known rule than that every act of the legislature is presumed to be constitutional, unless it be the one to the effect that no act will be held unconstitutional unless it is clearly so."
1. Every presumption is in favor of the validity of a statute, Ex parte Goddard, 44 Nev. 128, 190 P. 916, and a statute will always be sustained if there be any reasonable doubt of its unconstitutionality. State v. Westerfield, 24 Nev. 29, 49 P. 554. 2.
There is no better known rule than that every act of the legislature is presumed to be constitutional, unless it be the one to the effect that no act will be held unconstitutional unless it is clearly so. State v. Board of County Comr's., 21 Nev. 235, 29 P. 974; State v. Westerfield, 24 Nev. 29, 49 P. 554. 3. The title of the act of 1933 reads: "An Act declaring the purpose and policy of the legislature relative to use of the public highways of the state in the carrying of persons and property thereon in motor vehicles, defining such vehicles and public highways, providing for the licensing of certain carriers thereon by the public service commission of Nevada and providing and defining its duties in relation thereto, providing license fees for the operation of motor vehicles in carrier service for hire and other service on the public highways of the state, providing liability insurance in certain cases, providing for an official inspector and salary and allowances therefor, providing penalties for the violation hereof and other civil actions for the recovery of license fees herein, providing for the weighing of motor vehicles for license purposes by public weighmasters, and repealing all acts and parts of acts and certain acts of the legislature in conflict herewith; and other matters