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M-33 is a north–south state trunkline highway in the US state of Michigan that runs from Interstate 75 (I-75) at Alger in Arenac County north to M-27 near Cheboygan. In between, the trunkline runs through rural sections of the northeastern Lower Peninsula including state and national forest areas. M-33 connects to a handful of parks and crosses several of the rivers in that section of the state. It runs concurrently with three other state highways, sharing pavement to connect through several small communities of Northern Michigan. M-33 was designated by 1919 along a section of the current highway between Mio and Atlanta. The highway also included roadway segments south of Mio that are now parts of other trunklines. The portion south of Mio was rerouted in the mid-1920s, transferring sections to M-72 in the process. The state started extending M-33 in both directions in 1930s. The current highway segment between Onaway and Cheboygan was the former route of US Highway 23 (US 23) until 1940 when the latter highway was realigned onto an alignment that runs along Lake Huron. Several minor changes have been made to M-33's routing since the 1950s to straighten out curves or finish paving the highway. ==Route description== M-33 starts at exit 202 on I-75 near Alger.〔 From there it crosses a branch of the Lake State Railway and Old 76 Road before turning north. The highway runs north parallel to the Rifle River across the Arenac–Ogemaw County line. It meets the eastern terminus of F-18 and continues through woodland to an intersection with M-55 east of West Branch. North of the junction, the environment transitions to farm land that borders the edge of the Au Sable State Forest to the Rose City area.〔〔 North of Rose City, M-33 crosses into the Huron National Forest as the highway continues due north into Oscoda County, passing Mack Lake campground. M-33 follows Morenci Avenue into the center of Mio where the highway joins M-72 south of Mio Pond, and they run concurrently together across the Mio Pond section of the Au Sable River out of town. On the north side of the river, F-32 merges in from the east and the three roadway designations run concurrently north. The highway continues to a sweeping 90° turn east near Smith Lake. F-32 separates to turn west and M-33/M-72 turns eastward. The trunkline continues to Fairview where M-33 turns north, leaving the M-72 concurrency to continue northward. M-33 crosses into the Mackinaw State Forest and passes through Comins. North of that unincorporated community, the highway curves northeast, east and back north to cross into Montmorency County. Before reaching M-32, M-33 crosses the Thunder Bay River. After the river, M-33 turns westward along M-32 to the community of Atlanta. The highway passes near the Atlanta Municipal Airport as it enters the community. In the middle of town, M-33 turns back north. The highway provides access to the Clear Lake State Park in northern Montmorency County before crossing into Presque Isle County.〔〔 M-33 parallels the Cheboygan – Presque Isle county line as it runs northward along the Black River to Onaway. Once in town, M-33 turns west with M-68 toward Cheboygan County. The highway passes through Tower, and a junction with F-05, before it continues west to the Afton area. There M-33 turns north one last time, running along the east shore of Mullett Lake past Aloha and M-212;〔〔 M-212 is the shortest highway in Michigan that provides access to Aloha State Park.〔 North of Aloha, M-33 crosses the Cheboygan River and meets M-27, the location of its northern terminus south of Cheboygan. The Michigan Department of Transportation (MDOT) maintains M-33 like all other state trunkline highways in the state. As a part of these maintenance responsibilities, the department tracks traffic volumes using a metric called average annual daily traffic (AADT). This figure is a calculation of the traffic along a roadway segment for any average day of the year. In MDOT's surveys in 2009, they found that the peak AADT along M-33 was the 6,928 vehicles a day along a section of the M-72 concurrency. The lowest traffic counts were measured immediately south of the Onaway city limits at 956 vehicles daily. The only section of M-33 that has been listed on the National Highway System (NHS) is the segment concurrent with M-32 in Montmorency County. The NHS is a network of roads important to the country's defense, economy 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-33 (Michigan highway)」の詳細全文を読む スポンサード リンク
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