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Maryland Route 170 (MD 170) is a state highway in the U.S. state of Maryland. The state highway runs from MD 175 in Odenton north to MD 2 in Brooklyn Park. MD 170 connects the western Anne Arundel County communities of Odenton and Severn and the North County communities of Linthicum, Pumphrey, and Brooklyn Park with Baltimore/Washington International Thurgood Marshall Airport (BWI Airport). The highway connects BWI Airport with Interstate 695 (I-695) and MD 100 and forms part of the Airport Loop, a circumferential highway that connects the airport and I-195 with many airport-related services. MD 170 originally served as the main highway between Baltimore and Fort George G. Meade. This highway, which included part of modern MD 174 west of Severn, was mostly constructed shortly after Camp Meade was established during World War I in the late 1910s. The Odenton–Severn portion of MD 170 was originally built as MD 554 in the 1930s, but became part of MD 170 in the mid-1940s. MD 170 went through another round of upgrades in the early 1940s due to its strategic importance during World War II. The highway originally passed through the area now occupied by BWI Airport. MD 170 was relocated north of MD 176 in the late 1940s during the construction of the airport and south of MD 176 in the late 1950s. The highway has been expanded to four lanes around its interchanges with I-195, I-695, MD 32, and MD 100 and along the perimeter of BWI Airport since the 1960s. ==Route description== MD 170 begins at an intersection with MD 175 (Annapolis Road) in Odenton. The highway continues south as county-maintained Piney Orchard Parkway, which leads to the Odenton station on MARC's Penn Line and the Piney Orchard community. MD 170 heads north on Telegraph Road, which begins as a four-lane divided highway but reduces to a two-lane road and passes through an industrial area. The state highway expands to a four-lane divided highway again shortly before its diamond interchange with MD 32 (Patuxent Freeway). MD 170 continues north as a two-lane road with a center turn lane that crosses Severn Run. The center turn lane ends as the highway approaches the center of Severn. There, the highway intersects MD 174, which heads west as Reese Road and east as Donaldson Avenue. MD 170 expands to a four-lane divided highway as it approaches its single-point urban interchange with MD 100 (Paul T. Pitcher Memorial Highway). The highway becomes an undivided four-lane road between MD 100 and its intersection with MD 176 (Dorsey Road) at Harmans. The long ramp from westbound MD 176 to northbound MD 100 is unsigned MD 170A.〔〔 MD 170 continues north as Aviation Boulevard and joins the Airport Loop. The highway parallels the Amtrak Northeast Corridor, which carries MARC's Penn Line, and the hiker-biker BWI Trail. MD 170 meets the eastern end of Stoney Run Road, which heads east and immediately loops back west and crosses over the state highway and the railroad on its way to the BWI Car Rental Facility. The highway intersects unsigned MD 995 (Amtrak Way), which leads to the BWI Rail Station, as it gradually curves to the east. MD 170 crosses Kitten Branch immediately before its partial cloverleaf interchange with I-195 (Metropolitan Boulevard). The highway passes under the BWI Trail and expands to a divided highway before its intersection with Terminal Road and an at-grade intersection with the Baltimore Light Rail. Access to the rail line's BWI Business District station is via Elkridge Landing Road at the next intersection. MD 170 leaves the Airport Loop at its intersection with MD 162 (Aviation Boulevard), where the highway turns north onto Camp Meade Road.〔〔 MD 170 intersects the Baltimore Light Rail again and begins to parallel it as a two-lane road with a center turn lane. The light rail veers away to the east shortly before the highway's intersection with MD 762 (Andover Road), where the center turn lane ends. MD 170 enters Linthicum and intersects the light rail line a third time and begins to parallel it again shortly before the Linthicum station in the center of the community. The highway intersects MD 169 (Maple Road) and expands to a four-lane divided highway shortly before its partial cloverleaf interchange with I-695 (Baltimore Beltway). There is no access from MD 170 to eastbound I-695 or from westbound I-695 to MD 170. The highway reduces to a two-lane road again and passes the North Linthicum station just south of MD 648 (Baltimore–Annapolis Boulevard) in the center of Pumphrey. MD 170 continues northeast as Belle Grove Road, which veers away from the light rail line. The highway parallels the Patapsco River and passes under I-895 Spur (Harbor Tunnel Thruway) before entering Brooklyn Park. There, MD 170 reaches its northern terminus at a five-way intersection with MD 2, Jack Street, and Hanover Street at the Baltimore city limits. MD 2 heads south as Governor Ritchie Highway toward Glen Burnie and north into the city as Potee Street.〔〔 MD 170 is a part of the National Highway System from its southern terminus in Odenton to I-695 in Linthicum. Within that stretch, there are two sections that serve as intermodal passenger transport links: from its southern terminus to MD 32 in Odenton, and from MD 176 to MD 162 along the perimeter of BWI Airport. The portions from MD 32 in Odenton to MD 176 in Severn and from MD 162 to I-695 within Linthicum are National Highway System principal arterials.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Maryland Route 170」の詳細全文を読む スポンサード リンク
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