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This page is available for comment and discussion regarding the page Article VIII, Section 7-a of the Texas Constitution.
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Proceeds from the sale of agency salvage or surplus personal property purchased with funds dedicated to highway purposes by Texas Constitution article VIII, sections 7-a and 7-b are not themselves constitutionally dedicated to highway purposes. Accordingly, proceeds fi-om the sale of agency salvage or surplus property that was purchased with revenues constitutionally dedicated to highway purposes and sold on or after September 1’2003 may be placed in the general revenue fund.
https://www2.texasattorneygeneral.gov/opinions/opinions/50abbott/op/2004/pdf/ga0143.pdf
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Article VIII, section 7-a of the Texas Constitution does not apply to oil and gas royalties received for the depletion of highway rights-of-way that the state acquired using funds dedicated by article VIII, section 7-a. Rather, the disposition of such royalties is governed by statute.
https://www2.texasattorneygeneral.gov/opinions/opinions/48morales/op/1995/pdf/dm0370.pdf
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Article VIII, section 7-a of the Texas Constitution dedicates motor vehicle registration fees to a particular use; thus, the portion of the state highway fund that consists of state motor vehicle registration fees (and other constitutionally dedicated monies) may not be diverted to other purposes.
https://www2.texasattorneygeneral.gov/opinions/opinions/49cornyn/op/2002/pdf/jc0501.pdf