We cruised for hours today, and we are still in Texas on Interstate 10 (1959). This road is the major east–west Interstate Highway in the Southern United States. The longest segment is in Texas, at just under 880 miles. Interestingly, it is the longest continuous untolled freeway in North America that is operated by a single authority. I-10 is also the road that we will be on for most of our trek to Southern California.