Interstate 75

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Interstate 75 is an interstate highway in the midwest and southeastern United States. It goes from Florida State Road 826 (Palmetto Expressway) near Hialeah, Florida to Sault Ste. Marie, Michigan at the Ontario, Canada border.


Contents

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History

This limited access highway planned in the 1950s roughly follows the general route of many older at grade highways, including United States Highway 2, United States Highway 27, U.S. Highway 25, United States Highway 41 among others. Some of these older U.S. Highways (several of which are still in existence) in turn replaced the eastern route of the old Dixie Highway. The final stretch of Interstate 75 was completed in 1986 in Dade (present Miami-Dade) and Broward Counties in Florida, although the last stretch to receive the I-75 signage was a revamped Alligator Alley in 1993.

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Length

Miles km state
470.655 757.45 Florida
355 575 Georgia
161 261 Tennessee
192 311 Kentucky
211 342 Ohio
396 642 Michigan
1786 2893 Total


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Major cities along the route

Location of Interstate 75
Enlarge
Location of Interstate 75
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Intersections with other Interstates

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Spur routes

 Three-digit Interstates from Interstate 75
I-175 Florida
I-275 Florida - Indiana/Kentucky/Ohio - Michigan - Tennessee
I-375 Florida - Michigan
I-475 Georgia - Ohio - Michigan
I-575 Georgia
I-675 Georgia - Michigan - Ohio
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Lane configurations

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Michigan

  • between northern terminus and south end of Grayling Business I-75 loop (2 lanes on each side)
  • between south end of Grayling's BUS I-75 and US 127 (formerly US 27) (3 lanes southbound, 2 lanes northbound)
  • between US 127 and Exit 164 (M-13 Connector) (2 lanes on each side)
  • between Exit 164 and Exit 162 (US 10) (4 lanes each way)
  • between US 10 and Exit 130 (M-57) (3 lanes on each side)
  • between M-57 and north end of I-475 (Exit 126) (4 lanes each way)
  • between the northern I-475 interchange (126) and US 23 (Exit 117) (3 lanes each way)
  • between US 23 and southern end of I-475 (2 lanes on each side)
  • between I-475 and Pontiac (3 lanes on each side)
  • between Pontiac and Exit 75 (Square Lake Rd.) (4 lanes each way)
  • between Exit 75 and Exit 59 (Eight Mile Rd.) (3 lanes each way)
  • from Exit 59 to I-375 (4 lanes each way)
  • through I-375 interchange (2 lanes each way around ramps)
  • from I-375 to I-96 (4 lanes each way)
  • through I-96 interchange (2 lanes each way)
  • from I-96 to Exit 43 (M-85/Fort St.) (4 lanes each way)
  • from Exit 43 to Ohio line (3 lanes each way)
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Ohio

  • between Michigan line and I-280 (3 lanes on each side)
  • between I-280 (Exit 208) and I-475 (Exit 204) (2 lanes each way)
  • From I-475 (Exit 204) to downtown exits (202A/B) (4 lanes each way)
  • From downtown exits (202A/B) to SR 25 (Exit 201B) (2 lanes each way)
  • From SR 25 (Exit 201B) to I-475 (Exit 192) (3 lanes each way)
  • From I-475 (Exit 192) to milepost 78 near Piqua (2 lanes each way)
  • From milepost 78 to SR 4 interchange in Dayton (3 lanes each way)
  • Through SR 4 interchange (2 lanes each way)
  • From SR 4 to US 35 (mostly 3 lanes each way)
  • From US 35 to I-71/US 50 interchange in Cincinnati (3 lanes each way)
  • Between I-71 off- and on-ramps (2 lanes each way)
  • Brent Spence Bridge over Ohio River (4 lanes each way, SB lanes above NB lanes)
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Kentucky

  • Brent Spence Bridge over Ohio River (4 lanes each way, SB lanes above NB lanes)
  • From 5th St. exit in Covington (192) to I-275 (185) (4 SB, 3 NB)
  • Through I-275 interchange (3 lanes each way)
  • From I-275 (exit 185) to I-71 split (exit 173) (4 lanes each way)
  • From I-71 split (exit 173) to milepost 156 near Dry Ridge (3 lanes each way)
  • From milepost 156 to milepost 139 near Corinth (2 lanes each way)
  • From milepost 139 to milepost 70 south of Berea (3 lanes each way)
  • From milepost 70 to milepost 56 (2 lanes each way)
  • From milepost 52 to milepost 56 (4 NB - extra climbing lane, 3 SB)
  • From milepost 52 to milepost 42 north of London (2 lanes each way)
  • From milepost 42 to milepost 31 north of Corbin (3 thru lanes each way, auxiliary lanes for exits here and there)
  • From milepost 31 to Tennessee line (2 lanes each way)
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Tennessee

  • between Kentucky line and Exit 112 (2 lanes on each side)
  • from Exit 112 to I-275/I-640 interchange (3 lanes on each side)
  • along I-640 multiplex (3 to 4 lanes each way)
  • from I-40/I-640 western split to I-40 milepost 378 (3 lanes each way, being widened as of July 2005)
  • from milepost 378 to I-140 (Exit 376) (4 lanes each way)
  • from I-140 to I-40/I-75 split west of Farragut (3 lanes each way)
  • from I-40 to Exit 7 (SR 317 near Chattanooga) (2 lanes each way)
  • from Exit 7 to SR 153 (Exit 3) (4 lanes each way)
  • from SR 153 to I-24 (3 lanes each way)
  • through I-24 interchange (2 lanes each way)
  • from EB 24 to SB 75 ramp to Georgia line (3 thru lanes each way, auxiliary lane SB for US 41 exit)
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Georgia

  • from Tennessee line to Exit 269 (Barrett Parkway/Kennesaw) (3 lanes each way, a few climbing lanes on longer hills)
  • from Exit 269 to I-575 (Exit 268) (4 lanes each way)
  • from I-575 to I-285 (Exit 259) (5-7 lanes each way, more closer to 285, with 9 NB lanes very briefly just north of 285)
  • from I-285 to I-85 (3 lanes each way)
  • "Downtown Connector" (as many as 8 lanes each way)
  • not sure from I-20 south to I-285
  • from I-285 (Exit 238) to just before I-675 (Exit 227) (4 lanes each way)
  • from I-675 to northern city limits of Forsyth (3 lanes each way)
  • within Forsyth (4 lanes each way)
  • from southern city limits of Forsyth to Exit 177 (I-475) (4 NB, 3 SB)
  • from I-475 to I-16 (Exit 165) (2 lanes each way)
  • from I-16 to I-475 (Exit 156) (3 lanes each way)
  • from I-475 to milepost 103 near Cordele (3 lanes each way)
  • from milepost 103 to milepost 64 just north of Tifton (currently mostly 2 lanes each way, undergoing widening)
  • within city limits of Tifton (3 lanes each way)
  • from southern city limits of Tifton to milepost 19 near Valdosta (mostly 2 lanes currently, also undergoing widening)
  • from milepost 19 to Florida line (3 lanes each way)
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Florida

  • between Georgia line and Florida's Turnpike (Exit 329) (3 lanes each way)
  • between Turnpike and SR 582/Fowler Avenue (Exit 265) (2 lanes each way)
  • between SR 582 and milepost 201 near Nokomis (3 lanes each way except through Riverview and part of Brandon where it is 4 lanes each way)
  • between milepost 201 and I-595 (Exit 19) (2 lanes each way)
  • from I-595 to southern terminus (5 lanes each way)
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Notes

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Florida

The Alligator Alley section west of Fort Lauderdale, Florida is due east/west.

Originally, I-75 went through Tampa and St. Petersburg, while the current I-75 was called I-75E. But because of Interstate restrictions dealing with suffixes to routes, I-75 was rerouted along I-75E, and the original I-75 was renamed I-275.

I-175 and I-375 are very brief Interstates that go east into downtown St. Petersburg, while I-275 goes into downtown Tampa, across the Howard Frankland Bridge into St. Petersburg, then south across the Sunshine Skyway Bridge, reconnecting with I-75 in Manatee County, Florida.

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Georgia

In the center of Atlanta, Georgia, I-75 merges with I-85 for a short time. This strip of highway, called the Downtown Connector, is infamous for its bad traffic.

There were plans for a spur from Cordele into Albany, Georgia, called I-175; the roadway was constructed but was not given limited access. It was signed as SR 300 and called the Georgia-Florida Parkway instead.

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Ohio/Northern Kentucky

In the Cincinnati, Ohio Northern Kentucky area, I-75 runs together with I-71, from approximately 20 miles south of Cincinnati, over the Brent Spence Bridge across the Ohio River, splitting from I-71 immediately after entering Cincinnati, Ohio.

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Michigan

In Detroit, the spur route I-375 is the shortest signed Interstate highway in the United States (i.e. it has an actual sign with the road number on its stretch) at 1.06 miles (1.71 km). There are shorter Interstate highways, but none are signed.

I-75 connects Michigan's Upper and Lower Penninsulas via the 5 mile long suspension Mackinac Bridge.

At the northern end of I-75, at Sault Ste. Marie, Michigan, the Sault Ste. Marie International Bridge leads into Canada, into Sault Ste. Marie, Ontario. This is the closest connection of any Interstate to the Trans-Canada Highway. However, there is no direct freeway connection; bridge traffic funnels onto city streets.

The section between Grayling, Michigan and Michigan State Highway 32 was built in 1961. This section was built by converting the northbound lanes of U.S. Highway 27 to southbound lanes and building a new set of northbound lanes leaving the former southbound lanes as a strip of grass. The terminus of the freeway near downtown Grayling was converted to a partial interchange for what would become BL I-75 between that and M-93/Hartwick Pines Road.

Alongside that, the former segment of US-27 between Grayling and Gaylord, Michigan was turned back to local control. After this individual segment of freeway was completed, it left a gap between Gaylord and Indian River which was filled in a year later. While the gap was being filled in, a special "TO I-75" designation was applied to the former segment of US-27. Around that time, US-27's northern terminus was scaled back to 5 miles south of Grayling until it was redesignated as an extention of US-127 in 2001.

Up to the early 1970s, I-75 between Bay City and Gaylord was routed west to Clare then north, and was signed as "TEMP I-75". The routing between Alger and Roscommon was completed in the mid-1970s, and the temporary section reverted to U.S. routes, although of freeway quality.

TEMP I-75 between Bay City and Grayling, Michigan was a segment of freeway built to relay traffic from Bay city to Grayling. This segment was built as the real gap for I-75 was being filled in. That gap that was being filled in is the present-day designation between Bay City and Grayling.

This segment of freeway was designated TEMP I-75 in the 1960s when I-75 had several discontiguous segments. Some of the other highways taken to continue the journey were posted as "TO I-75" rather than TEMP I-75.

This freeway segment had some at-grade intersections at the time. The freeway had the US-10 designation at the portion between Bay City and Clare; and it had a concurrent transistion to US-27 near Clare.

The portion between Clare and Grayling was redesignated as an extention of US-127 in 2002 although it was posted as US-127 on a National Geographic road atlas in the year 2000.

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See also

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External links

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Sources

 This article relating to U.S. Interstate Highways is a stub. Please support the U.S. Interstate Highway WikiProject and help Wikipedia by expanding the stub.
Primary Interstate Highways Interstate Highway marker
4 5 8 10 12 15 16 17
19 20 22 24 25 26 27 29
30 35 37 39 40 43 44 45
49 55 57 59 64 65 66 68
69 70 71 72 73 74 75 76 (W)
76 (E) 77 78 79 80 81 82 83
84 (W) 84 (E) 85 86 (W) 86 (E) 87 88 (W) 88 (E)
89 90 91 93 94 95 96 97
99 238 H-1 H-2 H-3
Unsigned Interstate Highways
A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists
Two-digit Interstates - Three-digit Interstates
Gaps in Interstates - Intrastate Interstates
Interstate standards - Proposed Interstates
Retrieved from "http://en.wikipedia.org/wiki/Interstate_75"
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