 Interstate 370 ( abbreviated I @-@ 370 ) is a 2 @.@ 54 @-@ mile ( 4 @.@ 09 km ) Interstate Highway spur route off I @-@ 270 in Gaithersburg , Maryland to the western end of toll road Maryland Route 200 ( MD 200 , Intercounty Connector ) at an interchange that provides access to the park and ride lot at the Shady Grove Metro station . The road was built to relieve congestion on I @-@ 270 at rush hour. kwietnia 2016, the highway was renamed the Barbara A. Mikulski Highway .
Interstate 370 was built in 19