I'm probably one of the few who isn't a huge fan of filtering/lane splitting, at least with the current licensing. It's far too easy to get a license which means way to many idiots are driving around putting make up on, not using mirrors/signals etc. If it were harder to get a license and part of training mentioned that motorcycles will be going in between lanes (both stationary and moving traffic) I'd be happier with it. However just seeing people getting out of cars without even looking for oncoming traffic (cars parked on the side of roadways) and cyclists who do filter at lights almost doing summer-salts over people getting out of cars at stop lights without looking really worries me...