Spur 345 is the old route of US 87 through northern San Antonio, formed on January 26, 1962, as Loop 345.

On December 18, 2014, the section of Loop 345 from I-410 south to I-10 was removed from the state highway system, and the rest was redesignated as Spur 345.

Beginning at exit 524 of northbound I-10/US 87 freeway, it runs northwest along Front Street, concurrent with SH 27.

Two routes separate, with SH 27 heading west while Business US 87 turns to the north, reaching a junction with RM 473 in downtown Comfort.

It reaches its northern terminus at I-10 exit 523, which is where US 87 separates from the Interstate and heads north.

[24] Loop 493 was designated on October 2, 1970, when US 87 was upgraded between Lubbock and Tahoka and moved to the east of Woodrow.

[23] Business U.S. Highway 87-G was the old route of US 87 through Lubbock, formed in mid-1992 when Interstate 27 was completed and US 87 was moved onto it.

On February 25, 2010, Business U.S. Highway 87-G was cancelled, and TxDOT transferred ownership of the road to the city of Lubbock.

It runs north along two-lane, undivided Monroe Avenue, to the west of a BNSF Railway line.

The highway crosses FM 1729 (Main Street) before reaching its northern terminus at I-27/US 87 exit 15.

Its southern terminus is at exit 20 of I-27/US 87 in the Lubbock County portion of the city.

It heads north-northwest on South Avenue D before curving north, reaching an intersection with FM 597.

The highway travels in a northern direction through suburban areas, with the route becoming more rural towards the north.