# K-rail

> English word · Noun

## Definitions
1. A concrete barrier used to separate lanes of traffic.

## Etymology
This term is stipulated in a specification of the California Department of Transportation, who first started using concrete median barriers in the mid-1940s. The reason for the letter K is uncertain.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/k-rail