of the Hiawatha National Forest. West of Munising is a ferry dock offering transport to the Grand Island National Recreation Area, and at Munising there is easy access to Pictured Rocks National Lakeshore. The roadway also features variable-message signs to warn motorists of winter weather-related traffic closures along the lakeshore. Installed at the US 41 and M-94 junctions, the signs advise motorists which sections of roadway are closed. Per MDOT policy, only snowplows are allowed on these sections during a closure. The highway exits the Hiawatha National Forest at the Alger County–Schoolcraft County line along the Seney Stretch. Seney Stretch The portion of M-28 between Seney and Shingleton, called the Seney Stretch, is of "straight-as-an-arrow highway" across the Great Manistique Swamp, "though others claim it's , only because it seems longer." The Seney Stretch is the longest such section of highway in the state, and "one of the longest stretches of curveless highway east of the Mississippi." The highway is often cited as the "state's most boring route" according to the Michigan Economic Development Corporation (MEDC) and Hunts' Guide. The straightness and flatness over a great distance are given as reasons for the reputation of this stretch as boring. The road across the swamp was constructed parallel to the line of the Duluth, South Shore and Atlantic Railway (later the Soo Line Railroad). It was first numbered as a part of M-25 when that designation was used along today's M-28 east of US 41. The most significant changes made to the stretch since its original construction were the addition of passing relief lanes and a full-scale, year-round rest area in 1999. Part of the Seney Stretch forms the northern border of the Seney National Wildlife Refuge. Established in 1935, this refuge is a managed wetland in Schoolcraft County. It has an area of , and contains the Strangmoor Bog National Natural Landmark within its boundaries. Seney to eastern terminus Past Seney, M-28 once again enters woodlands on the eastern end of the Upper Peninsula. In Luce County, the roadway passes through the community of McMillan en route to Newberry. The Circle Tour departs M-28 to follow M-123 at Newberry, looping north to the Tahquamenon Falls State Park. East of town, the road passes Luce County Airport off of Luce CR 399. From there, M-28 crosses the east and west branches of the Sage River and passes south of Soo Junction,