Interstate Business Route 45
Interstate 45 has four active business routes, all toward the northern end of the freeway along former U.S. 75. Three business loops off IH 45 are within 20 miles of each other: Ennis, Palmer and Ferris. This is largely because SH 75, the designation of old U.S. 75 further south, ends at Exit 213. U.S. 75 was truncated south of Dallas in 1987, with SH 75 designated over the route between Conroe (Exit 84B) and Streetman.