Can I legally shoot a wild boar in a roadway in Texas?

In addition to Jon Mixon's answer, I want to point out that odds are you are not seeing an actual wild boar. What I suspect you're seeing is a peccary, locally known as a javalina. Looks much the same, but it's much smaller than a boar. read more

You cannot shoot on or across a roadway in Texas. If you do so, you are subject to arrest and prosecution regardless of your reasons for doing as such. You can, after obtaining a valid resident trapper's license or fur-bearing animal propagation permit hunt and kill feral hogs on private land with near impunity. read more

Feral hogs (Sus scrofa) are an old world species belonging to the family Suidae, and in Texas include European wild hogs, feral hogs, and European-feral crossbreeds. Feral hogs are domestic hogs that either escaped or were released for hunting purposes. read more