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M-3 is a north–south state trunkline highway in the Detroit metropolitan area of the US state of Michigan. For most of its length, the trunkline is known as Gratiot Avenue . The trunkline starts in Downtown Detroit and runs through the city in a northeasterly direction along one of Detroit's five major avenues. The highway passes several historic landmarks and through an historic district. It also connects residential neighborhoods on the city's east side with suburbs in Macomb County and downtown. Gratiot Avenue in Detroit was one of the original avenues laid out by Judge Augustus Woodward after the Detroit fire in 1805. It was later used as a supply road for Fort Gratiot in Port Huron under authorization from the US Congress in the 1820s. The roadway was included in the State Trunkline Highway System in 1913 and signposted with a number in 1919. Later, it was used as a segment of US Highway 25 (US 25) before that highway was functionally replaced by Interstate 94 (I-94) in the 1960s. The M-3 designation was applied to the current highway in 1973, and a southern section was reassigned to M-85 in 2001. ==Route description== The southern end of M-3 is at an intersection between Jefferson Avenue and Randolph Street near the near entrance to the Detroit–Windsor Tunnel, the Mariners' Church, and the Renaissance Center in downtown Detroit. This intersection also serves as the termini for M-10 and Business Spur I-375 (BS I-375). M-3 follows Randolph Street northward under the Detroit People Mover past Cadillac Square. North of Monroe Avenue, the street runs through the Randolph Street Commercial Buildings Historic District before M-3 crosses under the People Mover again and turns northeasterly along Gratiot Avenue, one of Detroit's five major thoroughfares. This street is a boulevard setup with four lanes divided with a median or center turn lane. Gratiot Avenue runs northeasterly through downtown, past Ford Field. Near the stadium, the street passes over I-375 (Chrysler Freeway) without any direct connections. On the east side of the freeway, M-3 runs past the Historic Trinity Lutheran and St. John's-St. Luke's Evangelical churches before intersecting the end of the Fisher Freeway, which at this location is an unnumbered connector to I-75 and I-375. Gratiot continues past the freeway on the city's east side, bordering residential neighborhoods along the way. Through this area, it had a continuous center turn lane, losing the grassy median it had in places downtown. The highway intersects Grand Boulevard near Dueweke Park, and at Van Dyke Avenue, it intersects the southern end of M-53. Gratiot Avenue crosses I-94 at the latter's exit 219 near the Coleman A. Young International Airport and an adjacent industrial area.〔〔 Past the airport, Gratiot Avenue once again runs through residential neighborhoods while being immediately bordered by commercial properties. The southern end of M-97 is at the intersection between Gratiot and Gunston avenues just northeast of the Outer Drive junction by the airport. The trunkline passes the Assumption of the Blessed Virgin Mary Church near a branch location of the Detroit Public Library at McNichols Street. Just before crossing M-102 (8 Mile Road), Gratiot Avenue widens back to a boulevard. This intersection marks the transition from Detroit and Wayne County to Eastpointe in Macomb County.〔〔 In Macomb County, M-3 follows a boulevard setup complete with Michigan lefts at the major intersections in the suburbs of Detroit. There are a series of commercial properties between 10 Mile Road and I-696 (Reuther Freeway) that includes the Eastgate Shopping Center in Roseville. Near 13 Mile Road, there is a partial interchange with I-94 that allows eastbound traffic, which is physically traveling northbound to access northbound M-3 and southbound M-3 traffic to access westbound I-94. The missing connections are possible through the adjacent interchange for Little Mack Avenue on I-94 which also connects to 13 Mile Road and Gratiot Avenue. North of 14 Mile Road, M-3 crosses into Clinton Charter Township next to the Hebrew Memorial Park, a cemetery.〔〔 North of the intersection with Metropolitan Parkway, Gratiot Avenue splits into a one-way pairing of Northbound and Southbound Gratiot avenues as it crosses into Mount Clemens near the Clinton River. The two separate streets are one, two, or even three blocks apart through the city's downtown area. North of the Patterson Street intersections, the two streets cross back into Clinton Township and merge back together in four-lane street with a center turn lane. North of M-59 (Hall Road). M-3 clips the southeastern corner of Macomb Township near Selfridge Air National Guard Base. The highway continues into Chesterfield Township. M-3 parts from Gratiot Avenue at the intersection with 23 Mile Road, turning eastward along that roadway to an intersection with I-94. At exit 243, M-3 terminates at this interchange and 23 Mile Road continues easterly as M-29.〔〔 M-3 is maintained by the Michigan Department of Transportation (MDOT) like other state highways in Michigan. As a part of these maintenance responsibilities, the department tracks the volume of traffic that uses the roadways under its jurisdiction. These volumes are expressed using a metric called annual average daily traffic, which is a statistical calculation of the average daily number of vehicles on a segment of roadway. MDOT's surveys in 2010 showed that the highest traffic levels along M-3 were the 73,957 vehicles daily south of 14 Mile Road in Roseville; the lowest counts were the 4,609 vehicles per day north of Cadillac Square in downtown Detroit. All of M-3 has been listed on the National Highway System, a network of roads important to the country's economy, defense, and mobility. 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「M-3 (Michigan highway)」の詳細全文を読む スポンサード リンク
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