What Does a Highway Sign with the Letters “HC” Mean?

The initials “HC” on a highway sign denote a route for cars delivering hazardous cargo. Hazardous cargo is not authorised, as indicated by a similar sign with the “HC” ringed in red and crossed with a diagonal red bar.

Hazardous cargo indicators differ from one state to the next. In some states, instead of a “HC,” a “HM,” which stands for hazardous materials, is utilised. The sign is typically black text on a white square background. The “HC” or “HM” may be encircled by a green circle when hazardous cargo is permitted. The typical sign indicating something that is not authorised is a red circle with a strike-out bar.

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