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2.
Chicago area nickname for an interstate on the city's south side (I-55). The term is derived from the double 5's in the name. It originated as trucker slang and is sometimes used by others.
The double nickle is so full of potholes I nearly wrecked my car.
by smartypants October 07, 2004
 
1.
Misspelling of Double Nickel. Can refer to Interstate Highway 55 or to a 55-mph speed limit.
"Thank god they raised the speed limit on the bypass from 55 to 65; that double nickle limit was making folks take the long way around."

"Ah, ten-four, Pig Pen, what's your twenty? Australia? Mercy sakes, ain't nothin' down there but Tasmanian devils and them Q-alla bears. What's that? No double-nickel limit? We gonna be there in a short, Pig Pen."
-C.W. McCall, "Round the World With the Rubber Duck"
by Alf112 December 26, 2006