Business Spur I-270 - North Bethesda and Potomac, Maryland

Interstate 270 Spur in Maryland is one of four Interstate spurs designated my the Maryland State Highway Administration (MDSHA). Others include I-495X (Cabin John Parkway) south from Exit 39 in suburban Washington, and I-895A and I-895B, connectors linking the Harbor Tunnel Thruway (I-895) in Baltimore with I-97 and MD 2 respectively. These routes are all unsigned for the most part.

Interstate 270Y, per MDSHA documents, is a 2.1 mile long freeway spur in suburban Montgomery County. Not a traditional business spur, I-270 Spur is merely the southwestern branch of Interstate 270 connecting the mainline with the Capital Beltway (I-495).

This heavily traveled route was previously signed with “spur” banners positioned above I-270 markers, but is essentially unsigned now with the exception of a single reference on a southbound I-270 overhead.

The freeway was signed as I-270 when the mainline from I-495 northwest to Frederick was designated Interstate 70S. This changed in 1973.