Interstate 45

Length

Major Cities Along the Route

• Houston, Texas
• Dallas, Texas

Intersections with other Interstates

• Interstate 10 in Houston, Texas
• Interstate 20 in Dallas, Texas
• Interstate 30 in Dallas, Texas

Spur Routes

• Unmarked I-345 in Dallas, Texas. I-345 is less than one mile (1.6 km) long and connects the end of I-45 to the end of US 75 along the east side of downtown Dallas. Since there are no signs labeling it as I-345, most people assume that is part of I-45 or US 75.

Notes

• I-45 is not only an intrastate Interstate, but also is the shortest Interstate ending in a 5.
• The ISTEA states that Oklahoma can submit U.S. Highways 69 and 75, from the Texas state line to Interstate 40 at Checotah, Oklahoma, as an interstate whenever it's ready for it. US 75 is controlled-access from Dallas to the Oklahoma border, as is US 69 from McAlester to Muskogee. But the 125 mile (201 km) segment in between is built almost entirely at-grade, and would require a politically risky bypass around Atoka.
• Despite this, some highway mavens propose extending I-45 from there to Muskogee, Oklahoma, then to Vinita, Oklahoma, and then through east Kansas along US 69 all the way up to Interstate 35 (where the US 69 freeway currently ends) in the Kansas side of suburban Kansas City.

Reference

• 2005 Rand McNally "The Road Atlas 2005" - newest feature- interstate mileage by state

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