I did something similar with a hammer I keep under my seat for camping. I camp a lot. Road rage is something I hate, but for some reason which I've yet to identify, MY SPACE on the road is mine. Its not until afterward I ask, why didn't I just pull over. My ex wife would have to tell me to stop and she'd drive now she's no more, i have a small picture of a police car on the dash pocket I can look at. It sounds stupid, but its helped me pull over. I often don't realize what's happening until the GPS starts telling me I'm speeding, so the photos next to that.

Just an idea that works for me. Sometimes its not about or can be self controlled Just like triggers can start something, mindfulness like the picture triggers me to stop.

And no, sadly sometimes it doesn't work. That's where I spend the next 28 days stressing when I open the mail.