In the USA, every state has a driving handbook, the handbook is the ultimate document containing traffic regulations, road safety and must know materials in order to obtain state driver’s license.
Official State of Texas Handbook: http://www.dps.texas.gov/internetforms/Forms/DL-7.pdf
If you are looking for another state, please visit the respective edrivingschool.org state page to access the state handbook. You can also directly visit the state Motor Vehicle Department for the official handbook.