I never wave here in Northern California either. The potential for disasterous consequences is too great, unfortunately.
This morning, however, while on the way to my office, I encountered a young lady in a white Nitro R/T. She smiled in a very friendly manner, and before I realized what I was doing, I returned the smile and waved! I thought all was well, but then I saw her in my rear-view mirror: She turned around and followed me!
She followed me to my office and parked behind me. I was not particularly concerned, since she was alone and very petite. I was convinced I could successfully protect myself (I am 6'5").
I exited my Nitro. She exited her Nitro, smiled, and said, "Hi. My name's Vicki." She held out her hand. I took her hand, shook it, and said, "It is a pleasure to meet you, Vicki."
She said that she had seen my Nitro R/T several times and had become greatly enamored of the styling--so much so that she had gone to a nearby dealership and purchased her R/T.
She asked me if I would mind answering a few questions. She seemed friendly and non-threatening, so I invited her to come into my office. She said that she had owned her R/T for only a few days and had some questions about the operation of the 6-disc CD changer, UConnect, and a few other issues. I answered her questions satisfactorily, and we visited for 30 minutes or so. It was a very pleasant visit.
Sometimes, waving can produce good results. I do not recommend it in general, however--at least not in California.
NITRORT - http://www.catechnologies.com/blog/mrnitro1.jpg