§46-16 Traffic regulation and control over private streets. Any provision of law to the contrary notwithstanding, any county and its authorized personnel may impose and enforce traffic regulations and place appropriate traffic control devices, and may enforce chapters 249; 286; 287; 291; 291C; 291E; 431, articles 10C and 10G; and 486, part III on the following categories of private streets, highways, or thoroughfares, except private roads used primarily for agricultural and ranching purposes: