map of the I-40 corridor

[meliss]

Hi. The girl lives in Sallisaw Oklahoma. She is raising money to go to Finland. Highway I-40 runs alongside the town, connecting Oklahoma to Arkansas. What does it mean "a map of the I-40 corridor? Why "corridor"? Thank you.
"She created a blog, asking strangers to sponsor her quest: “I understand our economy’s down right now, but I’ll gladly accept even the smallest amount of money,” she wrote. “I hope you’ll part with just a few dollars for some
girl with a crazy dream.” To show people where Sallisaw was, she included a map of the I-40 corridor." (The smartest kids in the world by Amanda Ripley)

 

[SoothingDave]

http://www.dictionary.com/browse/corridor?s=t

These definitions seem to apply:

a narrow tract of land forming a passageway, as one connecting two major cities or one belonging to an inland country and affording an outlet to the sea:

a strip of land or airspace along the route of a road or river:

 

[GoesStation]

We use the second definition SoothingDave posted for corridor frequently in AmE. In I-40, I stands for Interstate Highway, the newer of two highway systems largely funded by the US government.