Digital and conventional billboards along Harris County interstates and primary highways are regulated by the Texas Department of Transportation under the federal Highway Beautification Act and Texas Transportation Code Chapter 391. Harris County imposes no separate billboard permit; cities including Houston ban most new digital billboards.
Texas Transportation Code Chapter 391 and 43 Texas Administrative Code Chapter 21 implement the federal Highway Beautification Act, requiring outdoor advertising along Interstate, federal-aid primary, and National Highway System routes to hold a TxDOT permit. Digital billboards must hold display images at least 8 seconds, transition in under 1 second, no animation, and meet luminance limits at night. Texas allowed digital conversion of conforming permits from 2007 onward. Harris County has not adopted a separate billboard ordinance. Houston's sign code largely bans new off-premises and digital billboards inside city limits. The Sign Administration enforces both TxDOT permits and city zoning along incorporated routes; unincorporated areas defer to TxDOT alone.
Erecting or converting a billboard without a TxDOT permit is a Class C misdemeanor with $500 maximum fine per day under Section 391.0355, plus civil mandate of removal at the operator's expense and revocation of related conforming permits.
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Side-by-side rule comparisons with other cities in Harris County.
See how La Porte's digital billboards rules stack up against other locations.
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