I'm a Texan, and we are super proud of our highways and rest areas. They're clean, well-stocked, and have nice eating areas with plenty of garbage disposals available.
With such a big area and so many travelers (especially truckers) making their way across our great state, having good rest areas encourages people to take a break from driving and refresh themselves before hitting the road again. Also, there are still some stretches of highway where you might travel 40 or 60 miles before coming to the next small town. At night, everything's closed. Rest stops are a terrific public service.