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The state of Indiana uses exit numbers on two highways with freeway segments, on US 31 between Indianapolis and South Bend and SR 912 in northwest Indiana. The state of Iowa uses exit numbers on non-Interstate expressways, such as Iowa 163 or the non-Interstate portions of the Avenue of the Saints.
Manitoba has the fewest posted exit numbers. Highway 1 has three numbered exits. Exit numbers were first posted on the Perimeter Highway in 2001. Alberta has the newest exit number system. The province started posting exit numbers on Highway 2 in 2004, and has since extended the system to Highways 1, 16, 201, and 216. In 2006, Alberta started ...
If multiple exits occur within the same mile, letter suffixes may be appended to the numbers in alphabetical order starting with A. [68] A small number of Interstate Highways (mostly in the Northeastern United States) use sequential-based exit numbering schemes (where each exit is numbered in order starting with 1, without regard for the mile ...
There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower ...
However, there are also instances where the dominant exit number range is far more than the secondary route's highest exit number, for example the concurrency of I-75 and I-85 in Atlanta, Georgia—where I-75 is dominant—the exit numbers range from 242 to 251, while I-85's highest independent mile marker in Georgia is 179. [24]
It was previously a part of California State Route 238 that was built to Interstate standards, and it was added to the Interstate system using the same number it had as a state highway. It was upgraded to be an auxiliary route of I-80 , but no three-digit combinations were available at the time the route was designated an interstate.
In the 1950s, the numbering grid for the new Interstate Highway System was established as intentionally opposite from the US grid insofar as the direction the route numbers increase. Interstate Highway numbers increase from west-to-east and south-to-north, to keep identically numbered routes geographically apart in order to keep them from being ...
Until 2000, the state of Georgia used the sequential exit numbering system on all of its Interstate Highways. The first exit on each highway would begin with the number 1 and increase numerically with each exit. In 2000, GDOT switched to a mileage-based exit system, in which the exit number corresponded to the nearest milepost. [17] [18]