OK. I've only been riding a few months and only about 150 miles so far. The few times I see other riders on the road, most have given me a friendly little wave, and I tried to wave back if my hands weren't busy, and give a nod if they were. So today I was riding around town and saw a bike coming on the other side of the road. My left hand went up for a wave, then stopped when I realized that it was a police cruiser. No big deal. I'm just being friendly. But I'm wondering what's the common etiquette with police cruisers. Should I wave?