(a) The driver of a motor vehicle traveling through defiles or canyons or on mountain highways shall hold such motor vehicle under control and as near the right-hand edge of the highway as reasonably possible and, upon approaching any curve where the view is obstructed within a distance of two hundred feet along the highway, shall give audible warning with the horn of such motor vehicle.

(b) Any person violating the provisions of this section is guilty of a misdemeanor and, upon conviction thereof, shall be fined not more than $100; upon a second conviction within one year thereafter, shall be fined not more than $200; and upon a third or subsequent conviction, shall be fined not more than $500.