“Motor vehicle” means a device in, on, or by which a person or property is or may be transported or drawn on a highway, except a device used exclusively on stationary rails or tracks.
In other words, a motor vehicle does not have to have a motor. A little red wagon is a motor vehicle, for purposes of Texas’s DWI statute (a street is a highway). So if you are walking around Lights in the Heights operating (pulling) your wagon full of beer, and you’re intoxicated, you could be charged with driving while intoxicated.
I have found what I believe, in light of this information, to be the One True Grail of DWI arrests:
Yes, that’s fifteen possibly intoxicated people “operating” (pedaling) a “motor vehicle” (people-transporting device) in a public place: The Pedal Party.