SB 2324 modifies the Transportation Code to establish conditions under which tolls on certain Texas toll roads must cease. It ensures that once the costs of acquisition and construction of a toll project are paid and bonds are retired or sufficiently funded, the toll road must be maintained without tolls. The bill also requires a study by the Texas Department of Transportation to evaluate the costs of transitioning toll roads to non-toll status and repeals various provisions allowing surplus toll revenue to be used for other projects.