Interstate 75

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Interstate 75
Main route of the Interstate Highway System
Length: 1,786 mi (2,874 km)
South end: SR 826/924 near Miami, FL
Major
junctions:		 FL's Tpk. in Wildwood, FL
I-10 near Lake City, FL
I-85 in Atlanta, GA
I-20 in Atlanta, GA
I-40 in Knoxville, TN
I-70 near Dayton, OH
I-80/I-90/OH Tpk near Toledo, OH
North end: Int'l Bridge in Sault Ste. Marie, MI
(TO ON 17/Trans-Canada Hwy)
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Interstate 75 (abbreviated I-75) is an interstate highway in the midwest and southeastern United States. It travels from State Road 826 (Palmetto Expressway) and State Road 924 (Gratigny Parkway) in Hialeah, Florida (just west of Miami) to Sault Ste. Marie, Michigan at the Ontario, Canada border.

Contents

[edit] History

I-75 co-signed with I-85 in downtown Atlanta
I-75 co-signed with I-85 in downtown Atlanta

This limited access highway planned in the 1950s roughly follows the general route of many older at grade highways, including U.S. Route 2, U.S. Route 27, U.S. Route 25, and U.S. Route 41, among others. Some of these older U.S. Routes (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.

[edit] Length

Miles km state
470.655 757.446 Florida
355.11 571.49 Georgia
161 259 Tennessee
192 309 Kentucky
211 340 Ohio
396 637 Michigan
1,786 2,874 Total

[edit] Major cities and structures

Bolded cities are officially-designated control cities and other structures for signs.

[edit] Intersections with other interstates

[edit] Spur routes

 Auxiliary routes of Interstate 75
Current and Future (F) Former
I-175 Florida - Kentucky/Tennessee
I-275 Florida - Indiana/Kentucky/Ohio - Michigan - Tennessee
I-375 Florida - Michigan
I-475 Georgia - Michigan - Ohio
I-575 Georgia
I-675 Georgia - Michigan - Ohio

[edit] Lane configurations

[edit] Michigan

Main article: Interstate 75 in Michigan--Lane Configurations

[edit] 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 Cincinnati-Dayton Rd (Exit 21) (3 lanes each way)
  • From Cincinnati-Dayton Rd (Exit 21) to Interstate 275 (Exit 16) (4 lanes each way)
  • From Interstate 275 (Exit 16) to Interstate 74 (Exit 4) (3 lanes each way)
  • From Interstate 74 (Exit 4) to I-71/US 50 interchange in Cincinnati (4 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)

[edit] 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 through lanes each way, auxiliary lanes for exits here and there)
  • From milepost 31 to Tennessee line (2 lanes each way)

[edit] 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 through lanes each way, auxiliary lane SB for US 41 exit)

[edit] Georgia

Main article: Interstate 75 in Georgia--Lane Configurations

[edit] Florida

Main article: Interstate 75 in Florida--Lane Configurations

[edit] Notes

[edit] Florida

Main article: Interstate 75 in Florida

[edit] Georgia

Main article: Interstate 75 in Georgia

[edit] 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. In the Cincinnati area, I-75 is also known as the Millcreek Expressway. Part of it runs in the old right-of-way of the Miami and Erie Canal. I-75 inside I-275 through Greater Cincinnati is often times very congested during weekday business hours. Through travelers can many times save 1-2 hours by taking I-275 in either direction around Greater Cincinnati. The western stretch of I-275 (cuts through a corner of Indiana) is usually the least congested section of I-275.

[edit] Michigan

Main article: Interstate 75 in Michigan

In Detroit, the spur route I-375 is the shortest signed spur of I-75 at 1.06 miles (1.71 km). Interstate 375 is the shortest signed interstate highway. In addition, at that same junction, the I-75 curve where it shifts from the Fisher Freeway to the Chrysler Freeway is one of the sharpest on a mainline route in the entire Interstate system, with a 25 mph (40 km/h) advisory speed.

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

Mackinac Bridge
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 M-32 (Michigan highway) was built in 1961. This section was built by converting the northbound lanes of U.S. Route 27 to southbound lanes and building a new set of northbound lanes leaving the former southbound lanes as a strip of grass, most likely because of plans to upgrade that stretch to Interstate Highway standards. 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 extension of US 127 in 2001.

Until the early 1970s, I-75 between Bay City and Grayling was routed west to Clare (along US-10 then north along then-US-27, and was signed as "TEMP I-75". This freeway segment had some at-grade intersections at the time. In 2002 the portion between Clare and Grayling was redesignated as an extension of US 127, although it was posted as US 127 on a National Geographic road atlas in the year 2000.

In the 1960s, I-75 had several discontiguous segments connected with roads with "TO I-75" signs in addition to US 10 doubling as "TEMP I-75".

The routing between Alger and Roscommon was completed in 1973, and the temporary section reverted to U.S. routes, although of freeway quality.

Until the completion of I-75 in 1973, the stretch of expressway between Standish and West Branch had the designation of M-76. When the I-75 signs were erected along the expressway, M-76 vanished from the state road map after 53 years of existence.

Until 1987, US 10 and I-75 were the same road between Bay City and Clarkston. Both were also complexed with US 23 between Bay City and Flint. Now, Bay City serves as the eastern terminus of US 10.

As late as 1990, US 31 and US 23 both had their northern termini on I-75's southern approach to the Mackinac Bridge. Even though US 27 was scaled back 94 miles (from Mackinaw City to south of Grayling) in 1961, a lone sign assembly showed all three US highways ending at the same place as late as 1971.

[edit] See also

[edit] External links

[edit] Sources


edit
Main Interstate Highways (multiples of 5 in pink)		 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 66 (W) 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  A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists  Main - Auxiliary - Suffixed - Business - Proposed - Unsigned
Gaps - Intrastate - Interstate standards - Replaced
Browse numbered routes
< M-74 MI M-75 >
< I-74 OH I-76 >
< I-71 KY US 79 >
< SR 74 GA SR 75 >
< SR 74 FL SR 75 >
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