<P> In 1972, the American Association of State Highway Officials approved for the US 240 designation to be removed . As a result, MD 355 was extended south along the former US 240 alignment to the Washington, D.C. border . MD 355 was widened into a divided highway between Rockville and Gaithersburg in 1977 . The divided highway was extended north from Gaithersburg to Germantown by 1997 . In 2006, the northern terminus of MD 355 at the interchange with US 15 in Frederick was truncated to a dead end a short distance south of that route . In 2009, the portion of MD 355 north of the I - 70 overpass was transferred to the city of Frederick, with the MD 355 designation officially being removed from this stretch . In 2010, an interchange was completed at Montrose Parkway . </P> <P> A four - lane divided bypass of Urbana was constructed for MD 355 in the 2000s . The primary reason for constructing the bypass was to relieve traffic heading through the community brought on by the construction of numerous shopping centers in the area, and the costs for constructing the bypass were entirely paid for by the developers of an area shopping center . The proposal for the bypass called for two roundabouts to control traffic . The first portion of the road opened in late 2005 from MD 355 south to a roundabout at Sugarloaf Parkway . On October 30, 2008, construction began to build the connection of the bypass to MD 355 south of MD 80 . The bypass was completed by January 2009, at which point MD 355 was realigned onto it and the former alignment became MD 355 Bus . In 2013, maintenance of the bypass of MD 355 around Urbana was transferred from the developers to the state . </P> <Table> <Tr> <Th> County </Th> <Th> Location </Th> <Th> mi </Th> <Th> km </Th> <Th> Destinations </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Montgomery </Td> <Td> Bethesda </Td> <Th> 0.00 </Th> <Td> 0.00 </Td> <Td_colspan="1"> Western Avenue NW / Wisconsin Avenue NW south </Td> <Td> District of Columbia border </Td> </Tr> <Tr> <Th> 1.14 </Th> <Td> 1.83 </Td> <Td_colspan="1"> MD 191 west (Bradley Boulevard) / Bradley Lane east </Td> <Td> Eastern terminus of MD 191 </Td> </Tr> <Tr> <Th> 1.62 </Th> <Td> 2.61 </Td> <Td_colspan="1"> MD 187 east (Montgomery Lane) / MD 410 east (Montgomery Avenue) </Td> <Td> Eastbound direction of MD 187; eastern terminus of MD 187; eastbound direction of MD 410 </Td> </Tr> <Tr> <Th> 1.70 </Th> <Td> 2.74 </Td> <Td_colspan="1"> MD 187 north (Old Georgetown Road) / MD 410 west (East--West Highway) </Td> <Td> Westbound direction of MD 410; western terminus of MD 410; southern terminus of MD 187 </Td> </Tr> <Tr> <Th> 3.96 </Th> <Td> 6.37 </Td> <Td_colspan="1"> I - 495 (Capital Beltway) / I - 270 north--Baltimore, Silver Spring, Frederick, Northern Virginia </Td> <Td> Interchange; I - 495 exit 34; no access from MD 355 south to I - 495 north or I - 270 north </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td_colspan="1"> Grosvenor Lane to Beach Drive </Td> <Td> Northbound access only </Td> </Tr> <Tr> <Td> North Bethesda </Td> <Th> 5.27 </Th> <Td> 8.48 </Td> <Td_colspan="1"> MD 547 east (Strathmore Avenue) </Td> <Td> Western terminus of MD 547 </Td> </Tr> <Tr> <Td> Rockville </Td> <Th> 6.59 </Th> <Td> 10.61 </Td> <Td_colspan="1"> Montrose Parkway (MD 927A) to Randolph Road </Td> <Td> Interchange </Td> </Tr> <Tr> <Th> 8.71 </Th> <Td> 14.02 </Td> <Td_colspan="1"> MD 911 north (First Street) to MD 28 </Td> <Td> Southern terminus of MD 911 </Td> </Tr> <Tr> <Th> 9.05 </Th> <Td> 14.56 </Td> <Td_colspan="1"> MD 660 (Dodge Street) to MD 28 east / MD 586 east </Td> <Td> Southern terminus of unsigned MD 660 </Td> </Tr> <Tr> <Th> 9.17 </Th> <Td> 14.76 </Td> <Td_colspan="1"> MD 28 east / MD 586 (Veirs Mill Road) to I - 270 </Td> <Td> No access from MD 355 north to MD 28 east / MD 586 east </Td> </Tr> <Tr> <Td> Gaithersburg </Td> <Th> 12.68 </Th> <Td> 20.41 </Td> <Td_colspan="1"> I - 370 west (Intercounty Connector) to I - 270 </Td> <Td> Interchange; no exit to eastbound I - 370; I - 370 exit 2 </Td> </Tr> <Tr> <Th> 14.38 </Th> <Td> 23.14 </Td> <Td_colspan="1"> MD 117 west (West Diamond Avenue) / Fulks Corner Avenue </Td> <Td> Interchange, access to and from northbound MD 355 provided by Fulks Corner Avenue </Td> </Tr> <Tr> <Th> 15.43 </Th> <Td> 24.83 </Td> <Td_colspan="1"> MD 124 (Montgomery Village Avenue) to I - 270 </Td> <Td> </Td> </Tr> <Tr> <Td> Germantown </Td> <Th> 18.81 </Th> <Td> 30.27 </Td> <Td_colspan="1"> MD 118 south (Germantown Road) to I - 270--Germantown, Montgomery College </Td> <Td> Northern terminus of MD 118 </Td> </Tr> <Tr> <Th> 19.70 </Th> <Td> 31.70 </Td> <Td_colspan="1"> MD 27 north (Ridge Road)--Germantown, Damascus </Td> <Td> Southern terminus of MD 27 </Td> </Tr> <Tr> <Td> Clarksburg </Td> <Th> 22.90 </Th> <Td> 36.85 </Td> <Td_colspan="1"> MD 121 south (Clarksburg Road)--Boyds </Td> <Td> Northern terminus of MD 121 </Td> </Tr> <Tr> <Td> Hyattstown </Td> <Th> 26.45 </Th> <Td> 42.57 </Td> <Td_colspan="1"> MD 109 south (Old Hundred Road) to I - 270--Comus, Frederick, Washington </Td> <Td> Northern terminus of MD 109 </Td> </Tr> <Tr> <Td> Frederick </Td> <Td> ​ </Td> <Th> 27.07 </Th> <Td> 43.56 </Td> <Td_colspan="1"> MD 75 north (Green Valley Road) </Td> <Td> Southern terminus of MD 75 </Td> </Tr> <Tr> <Td> Urbana </Td> <Th> 30.16 </Th> <Td> 48.54 </Td> <Td_colspan="1"> MD 355 Bus . north (Urbana Pike) </Td> <Td> </Td> </Tr> <Tr> <Th> 30.25 </Th> <Td> 48.68 </Td> <Td_colspan="1"> MD 80 (Fingerboard Road) to I - 270--Buckeystown, Kemptown </Td> <Td> </Td> </Tr> <Tr> <Th> 31.28 </Th> <Td> 50.34 </Td> <Td_colspan="1"> MD 355 Bus . south (Urbana Pike) </Td> <Td> </Td> </Tr> <Tr> <Td> Frederick </Td> <Th> 36.59 </Th> <Td> 58.89 </Td> <Td_colspan="1"> MD 85 (Buckeystown Pike) to I - 70 / I - 270 / US 40--Baltimore </Td> <Td> </Td> </Tr> <Tr> <Th> 36.75 </Th> <Td> 59.14 </Td> <Td_colspan="1"> Market Street north--Downtown Frederick </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="6"> 1.000 mi = 1.609 km; 1.000 km = 0.621 mi <Ul> <Li> Incomplete access </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> County </Th> <Th> Location </Th> <Th> mi </Th> <Th> km </Th> <Th> Destinations </Th> <Th> Notes </Th> </Tr>

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