In the last two years I've carried it with me I can think of at least five times I've used it. Twice tossing it in an open passenger window during the exchange, twice sticking it under a wiper and once just pulling it out. ...that was my favorite- on one occasion a guy and I got in an argument about the legality and he pulled out a cell phone saying he was going to call the cops. I pulled out the pamphlet showed it to him and said go ahead. He just gave me the finger and rolled up his window. On the other occasions, I just road off as they were stuck in traffic. One guy I could still hear yelling as I road off. The other times it ended the exchange and their hostility.

Having a state document of the code literally has ended the argument immediately in every case. I keep a copy in the top flap compartment of my messenger bag so it's easy to pull out in five seconds while they're yelling that I can't be on the road "say really? because I happen to have a copy." Fortunately the way the lights are timed and with traffic, I can catch the jerk in 7/10 days on the street where 95% of my negative motorist interactions take place.