Farm to Market Road 1518
|Length:||16.615 mi (26.739 km)|
|Existed:||1949 – present|
|South end:||Loop 1604 in Adkins|
| FM 1346 in St. Hedwig
IH 10/US 90 Exit #591
FM 78 in Schertz
|North end:||IH 35 Exit #174A in Selma|
The southern terminus of FM 1518 is at a junction with Loop 1604 in the southeastern Bexar County town of Adkins. It continues north through the town of St. Hedwig and crosses Interstate 10 at its exit 591. The route then passes to the east of Randolph Air Force Base before reaching FM 78 near Schertz, just west of the Guadalupe County line. Officially, FM 1518 is discontinuous here, and the route designation resumes at another point farther east along FM 78. Now in Guadalupe County, FM 1518 travels through the southwestern portion of Schertz and into Selma, where it ends at an intersection with Interstate 35's exit 174A.
FM 1518 was designated in 1949 as a short route that connected unincorporated southern Bexar county communities 3.4 miles southeast of SH 346 to SH 346 (which would ultimately become part of SH 16). In 1952, FM 1518 extended 3.2 miles west to a road intersection. In 1953, the route was extended west 9.4 miles to US 81(now SH 132), replacing FM 1749 which connected US 81 and Bexar Community. In 1956, FM 1518 extended east to FM 1937. In 1958, FM 1518 extended east to US 81(now IH-35), replacing the section of FM 1937 from its current tend to US 87. FM 1518 also replaced FM 1316 from US 90 to FM 78 and FM 1621 from FM 78 to US 81. In 1963, FM 1518 extended west to FM 471, creating a route of approximately 66.5 miles (107.0 km) that looped around the southwestern, southern, and eastern portions of the greater San Antonio area. In 1973, the section of FM 1518 from FM 471 to what is now Loop 1604 was renumbered as FM 2790 and the section from there to SH 16 became a portion of FM 1604(now Loop 1604). In 1977, the section of FM 1518 from there to the current junction with Loop 1604 was transferred to Loop 1604. At that same time, FM 1604 was cancelled and renumbered as Loop 1604, shortening FM 1518 to its current route.  In 1995, the northern portion of FM 1518, from Interstate 35 to FM 78 (now Urban Road 78), was officially redesignated as Urban Road 1518; however, as with other urban roads, TxDOT continues to sign the route with the farm-to-market route marker.
- Transportation Planning and Programming Division. "Farm to Market Road No. 1518". Highway Designation Files. Texas Department of Transportation. Retrieved 2010-12-29.
- Transportation Planning and Programming Division. "Urban Road No. 1518". Highway Designation Files. Texas Department of Transportation. Retrieved 2010-12-29.
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