After driving in Italy, where any two wheeled vehicle can pretty much go wherever you want it to, I think lane splitting should be legal everywhere. Here's Why
1. You are forced to be aware of those little scooters and motorcycles because you never know when one will be there. (they always are)
2. Didn't take me long to adapt to it and also to make sure you don't use your windshield washers when one is behind you. (very colorful language and gestures)