(a) Permitted signs on the same side of a regulated freeway, including freeway frontage roads, may not be erected closer than 1,500 feet apart.
(b) For a highway on a non-freeway primary system and outside the incorporated boundaries of a municipality, permitted signs on the same side of the highway may not be erected closer than 750 feet apart.
(c) For a highway on a non-freeway primary system highway and within the incorporated boundaries of a municipality, permitted signs on the same side of the highway may not be erected closer than 300 feet apart.
(d) A permitted sign that is located within the incorporated boundaries of a certified city on a highway on a freeway primary system may not be closer than:
  (1) 1,500 feet to another sign that is on the same side of the highway and outside the incorporated boundaries of a municipality; or
  (2) 500 feet to another sign that is on the same side of the highway and inside the incorporated boundaries of a municipality.
(e) A permitted sign that is located within the incorporated boundaries of a municipality on a highway that is on a non-freeway primary system may not be closer than:
  (1) 750 feet to another sign that is on the same side of the highway and outside the incorporated boundaries of a municipality; or
  (2) 300 feet to another sign that is on the same side of the highway and inside the incorporated boundaries of a municipality.
(f) For the purposes of this section, the space between commercial signs is measured between points along the right of way of the highway perpendicular to the center of the signs.
(g) For the purposes of this section, a municipality's extraterritorial jurisdiction is not considered to be included within the boundaries of the municipality.
(h) The spacing requirements of this section do not apply to commercial signs separated by buildings, natural surroundings, or other obstructions in a manner that causes only one of the signs to be visible within the specified spacing area.
(i) A permitted sign may not be erected within five feet of the highway right of way line. The distance shall be measured from the end of the sign face nearest the right of way line.
(j) A permitted sign that is being displaced by a highway construction project will not be considered in determining the spacing for a new sign application.

Source Note: The provisions of this §21.187 adopted to be effective July 1, 2011, 36 TexReg 2418; amended to be effective April 19, 2012, 37 TexReg 2687; amended to be effective October 12, 2014, 39 TexReg 7954; amended to be effective March 14, 2018, 43 TexReg 1446