Texas State Highway 142State Highway 142 is a short Texas state highway that runs from San Marcos to Lockhart.HistoryThe route was designated on December 16, 1929 along its current route. Prior to May 28, 2009, the route was located entirely within Caldwell County. In that year, the SH 142 designation was extended into Hays County, concurrent with SH 80, to a junction with Interstate 35.