CB Slang / Speed talk
Double Nickel in trucking
Plain-English explanation
Double nickel is CB radio slang for 55 miles per hour. The phrase comes from the five-cent coin (nickel) doubled: two nickels equal ten cents, but in this case the doubling is numeric — 55, as if two fives were stacked. The term became widespread during the national 55 mph speed limit era that ran from 1974 to 1995, when that speed was legally mandated on most U.S. interstates. The Emergency Highway Energy Conservation Act of 1974 set the national maximum speed at 55 mph to reduce fuel consumption during the oil crisis. For truckers who had previously run at 65 to 70 mph on open interstates, the reduction meant longer trips, more hours behind the wheel for the same miles, and reduced per-hour earnings. CB radio became a tool for communicating about conditions, and the vocabulary that developed around speed limits — including double nickel — became part of the culture. Today, the national 55 mph limit is gone. Posted limits on U.S. interstates range from 65 to 80 mph depending on the state, and some states have different commercial vehicle maximums. Double nickel as an active speed reference is less commonly used than it was during the 1974 to 1995 period, but it is still understood and occasionally used on CB radio, particularly among older drivers. The term shows up in trucking culture, music, film, and general CB vocabulary as a reference to 55 mph, the national speed limit that defined a significant period of American highway trucking history.
CB slang is road shorthand. It can help with awareness, but dispatch notes, load paperwork, inspection records, and claims still need formal language.
Why it matters in trucking
Double nickel is historically significant trucking vocabulary and still comes up in conversation, on CB radio, and in references to trucking culture. Understanding it as a reference to 55 mph prevents confusion when the phrase appears in context.
The value is speed and shared awareness. The limit is that slang should never replace exact times, locations, document names, or safety-critical instructions.
Example in real use
Two drivers are talking on CB. One asks why the other is running so slow. The reply: "Catching up on hours, keeping it at the double nickel today." That means 55 mph — deliberately slow for the purpose of stretching available drive time without covering as many miles.
Where you might hear it
Double nickel is mostly older CB speed talk for 55 mph.
What to check first
- Write 55 mph in formal notes.
- Do not treat it as the posted speed limit unless signs confirm it.
- Avoid it when exact speed matters.
Common mistakes or confusion
- Assuming "double nickel" still reflects a legal speed limit — the national 55 mph limit ended in 1995, and current posted limits vary significantly by state and road type.
- Using double nickel in a dispatch note expecting the dispatcher to know exactly what speed it means — it is CB shorthand, not a formal number, and belongs in informal talk rather than written records.
- Treating this as an active, widely used term in daily CB communication — it is understood but less common than it was during the national 55 mph limit era.
Related terms
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Last updated: 2026-05-10