Neither are specifically mentioned in PC or Trans code that I have seen or read..., but are actions cited against using other existing laws..Wheelies and lane splitting are two things that motorcyclists do that are not explicitly forbidden under Texas law but sometimes get people tickets or arrested anyway.
§ 545.401. RECKLESS DRIVING; OFFENSE for wheelies.
and
§ 545.060, entitled "Driving on Roadway Laned for Traffic." for lane splitting.
One of our LEO's here would know better then I, as my data group is VERY small compared to those that do this for a living.
From the DPS site...
Q: Can I ride my motorcycle between cars in traffic?
A: The law doesn't specifically say one way or the other, but there are several statutes that may come to bear depending upon the circumstances, i.e. right of way, obligation to drive in a single lane, signal intention, passing with safety, etc. Motorcycles are considered equally as cars regarding traffic laws, so the single lane, signal intention and other statutes in the Transportation Code could come in to play.
The main statute that makes "lane splitting" illegal is Transportation Code Section 545.060, entitled "Driving on Roadway Laned for Traffic."
An operator on a roadway divided into two or more clearly marked lanes for traffic:
shall drive as nearly practical entirely within a single lane; and
may not move from the lane unless that movement can be made safely.