Иллинойс және Висконсин штатарындағы I-39 тас жолы

Interstate Highway in Illinois and Wisconsin

Interstate 39 (I 39) is a highway in the Midwestern United States. I 39 runs from Normal, Illinois, at I 55 to State Trunk Highway 29 (WIS 29) in the town of Rib Mountain, Wisconsin, which is approximately 6 mile (10 km) south of Wausau. I 39 was designed to replace U. S. Route 51 (US 51), which, in the early 1980s, was one of the busiest two lane highways in the United States. I 39 was built in the 1980s and 1990s. In Illinois, the route has a total length of 140.82 mile (227 km). In Wisconsin, I 39 has a distance of 182 mile (293 km). From Rockford, Illinois, to Portage, Wisconsin, I 39 runs concurrently with I 90. In Wisconsin, I 94 joins the pair in Madison until Portage. At 29 mile (47 km) in length, this concurrency of three Interstates is the longest in the country. From Portage northward, US 51 is cosigned with the Interstate and has exit numbers based on its mileage.

In Illinois, I 39 begins at I 55, north of Bloomington–Normal, Illinois. I 39's southern terminus is less than 1 mile (2 km) from I 74 as I 74 runs around the city of Normal. From the city, I 39 runs north largely through rural areas, intersecting Illinois Route 251 (IL 251) at exit 8. About 55 mile (89 km) north of the city, I 39 crosses the Illinois River over the Abraham Lincoln Memorial Bridge, which is 1.3 mile (2 km) long. Just north of the Illinois River, I 39 runs east of the cities of LaSalle and Peru before intersecting I 80 at exit 59. North of I 80, the wind turbines of the Mendota Hills Wind Farm can be seen from milepost 72 at Mendota north to near Paw Paw. I 39 intersects I 88 at exit 97 in Rochelle. Further north, I 39 crosses the Kishwaukee River before meeting US 20 on the southside of Rockford. I 39 then runs east concurrently with US 20 to where the Interstate joins the Jane Addams Memorial Tollway and I 90 near Cherry Valley. While concurrent, I 39/I 90 follows I 90's exit numbering. I 39/I 90 heads north to South Beloit. There is a toll plaza just south of Rockton Road. US 51 leaves I 39/I 90 at IL 75 at exit 1 in South Beloit, while I 39/I 90 continues north into Wisconsin. For all but 1 mile (2 km) that I 39 is in Illinois, it is designated concurrently with US 51.

I 39 enters from Illinois along with I 90, passing under County Trunk Highway P (CTH P, Stateline Road), and bypasses Beloit to the east. East of the town, the route has an interchange at exit 185 that serves as the terminus for both WIS 81, which heads westward into Beloit, and I 43, which provides access to Milwaukee. Subsequently, the highway enters Dane County as it passes west of Lake Koshkonong. It is joined at exit 160 by US 51 from Edgerton and serves as the southern terminus of WIS 73. US 51 leaves the route 4 mile (6 km) to the north and heads west through Stoughton. The Interstate gradually turns westward around Utica to an interchange with CTH N, providing access to Stoughton and Cottage Grove. It then turns gradually back to the north and meets US 12 and US 18 in Madison. I 39/I 90 bypasses Madison to the east, and I 94 joins the concurrency at the eastern terminus of WIS 30, an interchange known as the Badger Interchange. About 2 mile (3 km) to the north, the highway crosses US 151, which includes a south side access to High Crossing Boulevard. The last two Madison area interchanges are US 51 3 mile (5 km) northwest of the US 151 interchange and WIS 19 another 1 mile (2 km) northwest of the US 51 interchange. Access is provided to CTH V (West North Street) via exit 126 just west of DeForest 4 mile (6 km) further north. I 39/I 90/I 94 enter Columbia County 4 mile (6 km) north northwest of CTH V. and westbound US 10 2 mile (3 km) north of Casimir Road. The freeway then parallels the Wisconsin River for 6 mile (10 km) to an interchange with CTH DB east of Lake DuBay and 1 mile (2 km) south of the Marathon County line. An interchange with Bus. US 51 is just south of the Wisconsin River crossing after 4 mile (6 km) from Maple Ridge Road. I 39 ends 2 mile (3 km) further north at the interchange with WIS 29 east just southwest of Wausau. US 51 continues north on the freeway after WIS 29 toward Merrill. In the late 1960s and early 1970s, a major supplemental freeway system plan was proposed, with the goal of providing Illinois residents access to freeways within 30 minutes or less. One of the proposed routes, FAP 412, was a route that would extend from US 20 in Rockford to I 57 just north of Salem, similar to the earlier requested route. Due to traffic counts, only the portion between Rockford and Decatur was prioritized. Over the course of the 1970s, planning for the US 51 supplemental freeway took place in earnest. However, debate ensued over what type of highway should be built. The Illinois Department of Transportation (IDOT) wanted the entire highway built to Interstate Highway standards, but a transportation committee established to review the proposed supplemental freeway system recommended only Interstate construction between Rockford and I 80. The highway from Oglesby south to Decatur was recommended to be an at grade expressway, utilizing the existing road where possible. After a decade of lobbying by interest groups, it was announced in 1986 that US 51 would be rebuilt to Interstate standards from Oglesby to Normal. However, due to funding concerns and local opposition, it was decided that the Bloomington to Decatur segment would not be built to Interstate standards; this segment was made a four lane expressway. The first segment of the freeway opened 1984 from IL 5 (now I 88) in Rochelle, to US 20 in Rockford. When the freeway was completed south from IL 5 to I 80 in 1986, IDOT officially requested an Interstate designation for the new highway, and I 39 was officially designated. By December 1987, construction on the section of I 39 between I 80 and IL 251 was finished. The next section, between IL 251 and I 55 in Bloomington–Normal, was completed by 1992, although this stretch of the highway was opened in several phases as completed. In December 1989, the section from Bloomington–Normal to Hudson opened, a distance of about 4.4 mile (7 km). In early September 1992, another segment opened from IL 116 north to IL 17.