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I-35 from Jarell, TX to north of West, TX is being rebuilt.  According to TXDOT's chief engineer, it is the longest road construction project in the U.S. Ultimately, most of I-35 will be rebuilt. In addition, significant portions of I-20 and I-10 in TX have been rebuilt during the past decade. Moreover, I-635, which runs around Dallas, TX., is being upgraded, and I-35 from I-635 north through Denton will be rebuilt and/or upgraded. Clearly, TX has spent a lot of money on new highways.  But it has not ignored the existing roadways.  I continuously hear that TX roadways are not being maintained, and they are falling apart. I drive nearly 25,000 miles per year. All of it is on TX roadways.  And not just the same roadways. If they are falling apart, I don't see it. As per Table 1-27 of National Transportation Statistics, On-Line Edition, which rates roadway smoothness as an indicator of roadway conditions, with the high number (>220) being rough and a low number (<60) being smooth, the Interstate Highway System has been getting better since 1995 or before.  For example, in 1995 1.8 per cent of rural interstate highway mileage was rate >220, but by 2011 it had declined to .5 per cent. In 1995 13.9 per cent had been rate <60, but by 2011 it had increased to 37.0 per cent. In the case of urban interstate highways, the per cent > 220 was 1.8 per cent in 1995, but it declined to 1.5 per cent in 2011.  The per cent <60 increased from 11.4 per cent in 1995 to 24.7 per cent in 2011.  There are, of course, lots of numbers between the highs and lows, as well as for other roadways, but they suggest, as is the case with highway bridges, that they are being maintained and, in fact, are getting better.
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