Question: How much did it cost to make I75?

Interstate 75



Interstate 75 (I-75) is a major north–south Interstate Highway in the Great Lakes and Southeastern regions of the United States. As with most Interstates that end in a five, it is a major cross-country, north–south route, one of the longest in the U.S., from southern Florida to the northern tip of Michigan. It travels from State Road 826 (SR826, Palmetto Expressway) and SR924 (Gratigny Parkway) on the Hialeah–Miami Lakes border (northwest of Miami, Florida) to Sault Ste. Marie, Michigan, at the Canadian border.
I-75 passes through six different states over its routing. The highway runs the length of the Florida peninsula from the Miami area and up the Gulf Coast through Tampa. Further north in Georgia, I-75 connects to Macon and Atlanta before running through Chattanooga and Knoxville and the Cumberland Mountains in Tennessee. I-75 crosses Kentucky, passing through Lexington before crossing the Ohio River into Cincinnati, Ohio. In the Buckeye State, the highway runs up the western side through Dayton before crossing into Michigan north of Toledo. I-75 runs northeasterly along the Lake Erie shoreline and Detroit River into the city of Detroit before turning northwesterly and northward to the Mackinac Bridge where the freeway crosses the strait between Lakes Huron and Michigan. Further north, I-75 approaches the Canadian border down river from Lake Superior, 1,786 miles (2,874km) from its origins near the Atlantic Ocean.
Route description


Florida

I-75 starts at an interchange with SR924 and SR826 on the Hialeah–Miami Lakes border in suburban Miami. After an intersection with the Homestead Extension of Florida's Turnpike and an interchange with I-595 and the Sawgrass Expressway, the Interstate leaves the Miami metropolitan area and turns westward to travel through the Everglades along the tolled Alligator Alley, which brings the highway to the Gulf Coast and Naples, where it again heads north. Passing through Bonita Springs, Fort Myers, and Sarasota, I-75 encounters a series of construction projects that will increase the lane count from two lanes in each direction to three in each direction. The freeway enters the Tampa Bay metropolitan area before the interchange with I-275 northbound, which handles St. Petersburg-bound traffic. Within the Tampa metro are three more major junctions: One with the Lee Roy Selmon Expressway which carries traffic into downtown Tampa; one with I-4 which carries traffic across the center of the state to the East Coast; and another as I-275 traffic defaults back onto northbound. The freeway proceeds to enter suburban portions of Pasco, Hernando, and Sumter counties on its way to Ocala and Gainesville. At Lake City, Florida, the Christopher Columbus Transcontinental Highway, I-10, intersects with I-75. Afterward, the northmost stretch of I-75 in Florida exits the Sunshine State into southern Georgia.
Georgia


I-75 (unsigned State Route 401 within Georgia) enters Georgia near Lake Park, and it continues northward through the towns of Valdosta, Tifton and Cordele until it reaches the Macon area, where it intersects with I-16 eastbound towards I-75's route. After Macon it passes the small town of Forsyth. The freeway reaches no major junctions again until in the Atlanta metropolitan area. The first metropolitan freeway met is I-675, then followed by the Atlanta "Perimeter" bypass, I-285. It crosses inside the Perimeter and heads north several miles towards the Atlanta city center. Interstate 75 then runs concurrently with I-85 due north over the Downtown Connector through the central business district of Atlanta. The areas where I-85 and I-75 run concurrently are some of the most traffic-prone streets in the nation. After the two Interstates split, I-75 makes a beeline northwest, crossing outside the I-285 perimeter and heading towards the major suburban city of Marietta. This section of I-75 just north of I-285 has 15 through lanes. North of Marietta, the final major junction in the Atlanta metropolitan area is the I-575 spur. I-75 then traverses the hilly northwestern Georgia terrain as it travels towards Chattanooga, Tennessee. All of Interstate 75 in Georgia is at least 3 lanes in each direction.
Tennessee



The freeway enters Tennessee directly in the Chattanooga metropolitan area, where it intersects with I-24. Exiting Chattanooga to the northeast, I-75 passes through an area known for dense fog. Twelve people were killed and 42 were injured in a 99-vehicle accident on that stretch of I-75 in heavy fog on December 11, 1990.[2] I-75 does not meet any other highways until it overlaps I-40 near Farragut and heads eastbound. Together, they enter the outskirts of Knoxville, where I-75 overlaps itself with a different road, this time I-640, but only for a short time. When the two meet I-275, I-75 encounters some of its highest points of elevation through the Cumberland Mountains and Cumberland Plateau region, cutting through the uppermost peaks and ridges of the mountains.
Kentucky


I-75 continues northbound through the hilly, rugged terrain of the Cumberland Plateau region of Kentucky passing through London and Richmond, eventually reaching Lexington, where it briefly runs concurrently with I-64 before splitting off in the direction of Georgetown and Covington. Near Walton, I-71 merges with I-75, making for yet another overlapped portion of freeway. I-275, which is a beltway around Cincinnati, Ohio is then intersected by I-71/I-75. After passing through Covington, the freeway crosses the Ohio River via the lower level of the Brent Spence Bridge (while the southbound direction uses the upper level) and continues into downtown Cincinnati.
Ohio


Immediately after entering Cincinnati, I-71 separates from I-75, taking a more east and northeasterly routing through the city, while I-75 remains generally northbound throughout the metropolitan area. I-74 westbound, Ohio State Route 562 (SR562) eastbound, and SR126 all intersect the freeway as it makes its way northward. In Arlington Heights, a Cincinnati suburb, I-75 sees a carriageway split for a few miles. After another interchange with the I-275 beltway, the freeway continues in the metropolitan area, passes through Middletown and heads toward Dayton, where I-675, I-70, and U.S. Route 35 (US35), have interchanges. The intersection of I-75 with I-70 is known as the Freedom Veterans Crossroads.[3] After exiting the city of Dayton, I-75 makes its way northbound through Ohio, passing through the smaller cities of Troy, Wapakoneta, Lima, Findlay and Bowling Green before finally reaching Toledo, and its suburbs located on the Michigan border on the western shore of Lake Erie. I-75 meets I-475 south of the city in the suburb of Perrysburg and then the cross-country highways of I-80/I-90/Ohio Turnpike. The freeway passes through downtown. I-475 then meets with I-75 again just north of downtown. The Interstate then continues through an industrial part of the city, as it progresses north before approaching I-280, which is the last major junction in Ohio. I-75 then passes by the Lake Erie neighborhoods of Shoreland and Point Place, just before crossing into Michigan.
Michigan



Upon entering Michigan, I-75 follows the northwestern shore of Lake Erie passing through Toledo's bedroom lake shore communities of Erie and Luna Pier, until about Monroe, when it heads northeastward to enter Detroit and its surrounding suburbs. The freeway intersects another I-275 in the Detroit metropolitan area, and no other major junctions are present until downtown. Once near downtown, I-75 meets the Ambassador Bridge to Windsor, Ontario, I-375 (Chrysler Freeway), I-94 (Edsel Ford Freeway), I-96 (Jeffries Freeway), M-10  (Lodge Freeway) and M-8 (Davison Freeway). I-696 (Reuther Freeway) also intersects I-75 in the northern metro area. When the freeway reaches Pontiac, there is a junction with M-59, and further north in Flint, the Interstate meets I-475 and I-69, and overlaps US23. The freeway then heads north towards Saginaw, where I-675 acts as a spur route into the city. Further north in Bay City, US10 provides access to Midland as well as downtown Bay City. When the freeway nears Standish, US23 branches off I-75 to Lake Huron, where it heads north. The last major interchange occurs at 4 Mile Road just south of Grayling where US127 northbound ends with traffic merging onto northbound I-75 and the southbound starts taking drivers southward through the center of the state. At Mackinaw City, I-75 intersects the northern ends of US31 and US23 before crossing the Mackinac Bridge to reach the Upper Peninsula (UP). I-75 is the only Interstate located in the UP, and it continues until the Canadian border in Sault Ste. Marie, at the International Bridge.
History

This limited access highway that was planned in the 1950s roughly follows the general route of many older at-grade highways, including US2, US27, US25, and US41, among others. Some of these older US Highways (several of which are still in existence) previously had replaced the eastern route of the old Dixie Highway.
I-75 was planned to end in Tampa, Florida, in the original plan for 41,000 miles (66,000km) of Interstate Highways. However, beginning in the 1960s, there was a huge growth in the population of Southwest Florida (Sarasota, Fort Myers, Naples, Cape Coral, etc.), hence the need for new highways, especially a north–south freeway, as well as one connecting Florida's Gulf Coast to South Florida.[4] At first, Florida state legislators proposed a toll in the new highway, but by 1968, it was decided that the federal government would pay 90% towards the extension of I-75 to southwestern and southeastern Florida.[5] This included subsuming a toll highway from Naples to the Fort Lauderdale area, the Alligator Alley, and furthermore to connect this expressway with I-95 in North Miami—though due to some local opposition, I-75 presently ends a few miles short of I-95.
On December 21, 1977, I-75 was completed from Tampa to Sault Ste. Marie with its final segment opening between northern Marietta, Georgia, and Cartersville, Georgia. The final stretch of I-75 in South Florida was completed in 1986 in Miami-Dade County and Broward County, but the last stretch to receive the signs for I-75 was the reconstructed (rebuilt and widened) Alligator Alley on November 25, 1992.[6]
Junction list
Florida
SR826 / SR924 on the Hialeah–Miami Lakes city line
I-595 on the Davie–Sunrise-Weston tripoint
US27 in Weston
US17 on the Solana–Cleveland CDP line
US301 in Ellenton
I-275 east-northeast of Terra Ceia
US301 in Palm River-Clair Mel
I-4 in Mango
I-275 on the Lutz–Wesley Chapel CDP line
US98 west-northwest of Ridge Manor
Florida's Turnpike southeast of Ocala
US27 in Ocala
US441 in Alachua
US41 / US441 in Ellisville
US90 in Lake City
I-10 west-northwest of Five Points
US129 north-northeast of Suwannee Springs
Georgia
US84 / US221 in Valdosta
US41 northwest of Valdosta. The highways travel concurrently to Hahira.
US82 in Tifton
US41 in Tifton
US280 in Cordele
US41 in Unadilla
US41 in Perry
US341 in Perry
I-475 southwest of Macon
US41 in Macon
US80 in Macon
I-16 in Macon
US23 northwest of Macon
I-475 northwest of Bolingbroke
I-675 in Stockbridge
US19 / US41 west of Morrow
I-285 in Forest Park
US19 / US41 on the Atlanta–Hapeville city line
I-85 in Atlanta. The highways travel concurrently through Atlanta.
I-20 in Atlanta
US29 / US78 / US278 in Atlanta
US41 in Atlanta
US41 in Atlanta
I-285 in Cumberland
I-575 north-northwest of Marietta
US411 in Cartersville
US41 in Resaca
US41 / US76 in Dalton
US41 / US76 southeast of Ringgold
Tennessee
US41 / US76 in East Ridge
I-24 on the East Ridge–Chattanooga city line
US11 / US64 in Chattanooga. The highways travel concurrently to north of 

Collegedale.
US74 in Cleveland
US321 in Lenoir City
I-40 west of Farragut. The highways travel concurrently to Knoxville.
I-140 in Knoxville
US11 / US70 in Knoxville
I-40 / I-640 in Knoxville. I-75/I-640 travels concurrently through Knoxville.
US25W in Knoxville. The highways travel concurrently through Knoxville.
I-275 / I-640 / US25W in Knoxville
US441 in Rocky Top
US25W in Rocky Top. The highways travel concurrently to Caryville.
US25W in Jellico
Kentucky
US25W in Goldbug
US25W in Corbin
US25 east-southeast of Mount Vernon
US25 in Mount Vernon
US25 in Richmond
US25 / US421 south-southeast of Lexington. The highways travel concurrently to Lexington.
US60 in Lexington
I-64 in Lexington. The highways travel concurrently through Lexington.
US27 / US68 in Lexington
US460 in Georgetown
US62 in Georgetown
I-71 in Walton. The highways travel concurrently to Cincinnati, Ohio.
US42 / US127 in Florence
I-275 in Erlanger
US25 / US42 / US127 in Fort Mitchell
US25 / US42 / US127 in Covington
Ohio
US22 / US27 / US42 / US52 / US127 in Cincinnati
US50 in Cincinnati
US27 / US52 / US127 in Cincinnati. I-75/US27/US52 travel concurrently through Cincinnati.
I-74 / US27 / US52 / US127 in Cincinnati
I-275 in Sharonville
I-675 southeast of Miamisburg
US35 in Dayton
I-70 in Vandalia
US40 in Vandalia
US36 in Piqua
US33 in Wapakoneta
US68 in Findlay
US224 in Findlay
US6 in Bowling Green
I-475 / US23 in Perrysburg. I-75/US23 travels concurrently through Perrysburg.
US20 / US23 in Perrysburg
I-80 / I-90 in Rossford
US24 in Toledo
I-475 in Toledo
I-280 in Toledo
Michigan
I-275 north-northeast of Monroe
US24 in Taylor
I-96 in Detroit
I-375 in Detroit
I-94 in Detroit
I-696 on the Ferndale–Hazel Park–Royal Oak–Madison Heights city line
US24 west-northwest of Clarkston
I-475 west of Grand Blanc
US23 south-southwest of Flint. The highways travel concurrently to southwest of Standish.
I-69 in Flint
I-475 west of Beecher
I-675 east of Saginaw
I-675 north-northwest of Zilwaukee
US10 west of Bay City
US127 south of Grayling
US31 north-northeast of Carp Lake
US23 in Mackinaw City
US2 in St. Ignace
Sault Ste. Marie International Bridge at the Canada–United States border in Sault Ste. Marie
Auxiliary routes
Tampa–St. Petersburg, Florida: I-175, I-275, I-375
Macon, Georgia: I-475
Atlanta, Georgia: I-675
Suburban spur to Canton, Georgia: I-575 in the Atlanta area
Knoxville, Tennessee: I-275
Cincinnati, Ohio: I-275
Dayton, Ohio: I-675
Toledo, Ohio: I-475
Detroit, Michigan: I-275, I-375
Flint, Michigan: I-475
Saginaw, Michigan: I-675







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 Geographic data related to  at OpenStreetMap
 at Michigan Highways
 on Cincinnati-Transit.net