Presented here are two great links to web sites about the history of transportation in Texas.
The first one covers the history of Highways from 1917 to 1968.
From Pioneer Paths to Super Highways (from to Texas State Library & Archives Commission)
The second one covers the History of the Texas Railroad Commission and its role in regulating transportation in Texas.
Hazardous Business (from the Texas State Library and Archives Commision)
Thanks to Kevyn Barnes for this post.