
Like Interstate 2 (I-2), I-27 and I-45, I-37 is an intrastate interstate highway that runs entirely within Texas. Its total length is 143 miles.
San Antonio and Corpus Christi (and the Texas Gulf Coast) are linked by I-37. The highway also provides connectivity to the Rio Grande Valley via U.S. 281/I-69C and U.S. 77/I-69E. In addition, I-37 has a public safety role – it is one of the few limited-access hurricane evacuation routes from the Texas coastline inland toward San Antonio and Austin.
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https://www.freightwaves.com/news/freightwaves-classicsinfrastructure-i-37-is-a-critical-hurricane-evacuation-route