It's unlikely they came down off the mountain on stone tablets, but the Vatican has released 10 Commandments for Drivers. Click HERE to see all 10.
I'd say most are pretty common-sense. Don't kill is #1. (Duh! I coulda sworn that one was in the original Ten Commandments!) (How about squirrels?) Others seem to deal with being a good Samaritan, having charity and forgiveness rather than vengeance, etc.
The one that caught my eye, as a cyclist:
9. On the road, protect the more vulnerable party.
Ya gotta like that concept. High-five Pope Benedict!
I'd say it would be easier to just have a Golden Rule for Roadway Users - Treat other roadway users the way you'd like to be treated - and be done with it.