Business Loop I-25 - Aguilar

The lone business spur for I-25 angles 1.95 miles southwest from Exit 34 along Lynn Road and Fir Street. Business Spur I-25 follows an old alignment of U.S. 85-87-160. The route concludes with an end sign at the Fir Street intersection with Main Street in Aguilar.

Business Spur I-25 to Aguilar was largely unsigned with only one shield at its western end and no mention from the mainline freeway previously. This changed by August 2012, when ample signs were erected along the entirety of the route and on the Interstate 25 northbound mainline.

CDOT inventories the business spur as Route 025B.