FWIW, I agree with Mr. Hurst in saying that lane splitting is not vehicular. That's not to say that I don't do it as well. It's not to say that I don't do it in a car either. But I understand that it is a risky maneuver which is not in keeping with vehicular principles on the road and so I have to be ultra aware of people around me and assume that nobody sees me.
To ride vehicularly is to stop behind stoped vehicles in your lane. Period. I'd venture that in some places with well designed and layed out bike lane, riding in the bike lane past the line of traffic is also vehicular, as there are no cars blocking your lane. However, the bike lane must pass some qualifications before I'd consider this a vehicular maneuver. One is that it must be full width. Two is that it must continue on the other side of the intersection (not that I stay in line all the time when it doesn't continue, but this maneuver, too, is not vehicular but rather it is me on my bike taking advantage of my bicycle to carefully break the rules).
If you are splitting lanes, this is not in accordance with universal vehicular rules of the road. Note that, in California, motorcycles can do this in limited situations. Note also that this is an exception carved out for motorcycles, allowing them to break with the normal vehicular rules of the road in a certain limited situation. It is not universal, as not all states have this exception written into their laws. In Oregon, this manuever is illegal.