I live in Colorado.
The first time, about six years ago when I rode my bike to California I gave lane splitting a try. I respectfully slowly passed cars that were standing still or were going very slow in heavy traffic. I did immediately notice that cars in the left two lanes kept plenty distance (thank you).
Until other motorcycles were flying around me at ridiculous speeds, this while I was already in between cars.
My lane splitting experiment lasted no more than five minutes, after that I just stayed in my own lane.
OK, I understand that there are now some official rules in California around lane splitting, rules about speed of traffic and speed allowed while passing. If motorcyclists hold themselves to these rules, wonderful. I'll give this an other try next time I am out there.
Lane splitting in Colorado?
That scares me: there will have to be a great amount of respect and attention from drivers in cars to make extra space available between the left two lanes, and with that, cars would have to stop swerving between lanes when they see one extra inch of space in the next lane. I honestly doubt we'll ever get to that point here.
100% stopped traffic however? If there is enough room available left and right of me I'd definitely, slowly, start passing cars, but that again depends on there being enough room.
This bad boy right now will do one surely-illegal thing: I sometimes, very slowly, will use the shoulder of the highway, emphasis on 'slow'. Anyone ever having been stuck in east bound weekend traffic on I70 will know that I mean.
2003 1800s, 88k miles