US Law Enforcement Response, Time, Scale and Coordination (Galveston, TX)

[Fred Brackin]

Originally Posted by Icelander

W


I-45 is completely within Texas, but, of course, it is probably used for all sorts of interstate commerce.
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If it's not obvious the "I" designation always indicates a road that's part of the Interstate highway system (and funded in that manner). Where the money starts out from decides where the legal authority ends up with.

I-45 isn't unique. I believe I-16 goes only from Savannah to Macon, all within Georgia.

State roads get an "SR" number (at least in Florida and adjoining states).