double-nickel

[duhb-uh l-nik-uh l] /ˈdʌb əlˈnɪk əl/
noun, Slang.
1.
the national speed limit of 55 miles per hour as established in 1974 on U.S. highways.
Origin
1975-80
Slang definitions & phrases for double nickel

double nickel

noun phrase
  1. The 55-mile-per-hour speed limit (1970s+ Citizens band)
  2. Interstate Highway 55, running south from Chicago (1980s+)