What does the expression 'double nickels on the dime' mean?

Question

i'm curious considering it's the name of the third minutemen album

& also pretty much everywhere i look.

Answer 1

The following that I clipped from Wikipedia seems to explain it:

The band illustrated the theme on the cover of Double Nickels on the Dime, which depicts Watt driving his Volkswagen Beetle at exactly 55 miles per hour ("double nickels" in trucker slang) on California's Interstate 10 (known as the "Dime").[16]