Texas Legal Guide (texaslegalguide.com) is currently under construction.
This page is available for comment and discussion regarding the page Article VIII, Section 7-c of the Texas Constitution.
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"The absence of a definition of 'toll road' in the constitutional provisions, statutes, or caselaw leaves us unable to determine whether the Commission may use Proposition 1 and Proposition 7 monies on non-tolled portions of toll projects."
https://www2.texasattorneygeneral.gov/opinions/opinions/51paxton/op/2018/kp0197.pdf