Vantaggi
Lots of time off potential, especially since they don't pay overtime, and instead earn comp time. If you get fired then you did something completely stupid and unethical because nobody loses their job. Close knit working environment and friendly people. Great place to get career experience to move on elsewhere. Even though the pay is bad, the benefits are pretty good.
Svantaggi
The pay. If you are not a CIVIL engineer it's pretty much a dead end place to work. Even for non-engineering positions TxDOT tends to hire engineers for. Upper administration makes decent money but regular employees don't. Management doesn't allow much decision making from regular employees and discourages it. The only potential to become a manager is if someone dies or retires. You are an enemy of the public and the media.