Read the account on this blog -- does anyone else remember encountering someone like this in Oxnard? It's possible that they were responsible for disappearances elsewhere in CA.
http://www.pamrotella.com

"It's hard for me to believe, but... Seeing the old photos in this article's embedded video reminds me of an old incident in California. This was probably sometime during 1993-96, although it could have been as early as '92. Only it wasn't in northern California, it was on Highway 1 near Point Mugu, between Santa Barbara and Malibu.

"Back then, highway 1 was a freeway-like road with exits as you came into Ventura County, with two lanes in each direction, wide shoulders and no traffic lights. One night I was returning to my apartment north of there, and a white van managed to get in front of me and drove very slowly, but wouldn't allow me to pass. He'd zig-zag across lanes every time that I tried to pull alongside him. It was clear that he was trying to bottle me up behind him, and that he was probably some kind of psycho, but I interpreted his zig-zagging as him being drunk. And I wasn't going to cut him a break if he was drunk because he was being such a jerk. Back then, cell phones were expensive and not everyone had one, but I was one of the few who'd invested in one because I traveled alone frequently. I called 911 right away and reported the man for drunk driving." etc.