Removing or alternating passing/overtaking possibilities on undivided rural highways, together with the introduction of narrow-profile guard rails between the center lines is a technique that was pioneered very successfully by Sweden and has now been used with similar success in New Zealand. And there’s definitely both the scope and the need to use it in the USA, too.
In this post, I am not particularly picking on California as such, because the weird situation I’m about to describe apparently happens in many, or maybe even all states (see the Massachusetts example in the photo below).
On July 20, 2017, the California Department of Motor Vehicles published this on its Facebook timeline: ‘Don’t litter! The fine is $1,000, & you may be forced to pick up what you threw. Convictions go on your driving record.’ (Our italics, for emphasis.)
An attached photograph on the DMV post shows a picture of somebody dropping trash from the driver’s door window of a white car.