Perhaps you're right; the spleaf might slow down the fast ones..
Problem is, within Boulder, Weld Counties and in & around Denver, the idiot, big-ass-4x4 & SUV-owners always hogged lanes, took extra wide turns and crossed over lanes like it was nothing.
Smoking dope will make that aspect worse.
Add snow and ice?
Pfffft !!!!!
Glad I moved away from there..