A physical sign or post installed at one-mile intervals along a highway to help drivers and emergency responders pinpoint exact locations. They are used for reporting accidents, planning maintenance work, and calculating route distances. In many jurisdictions, exit numbers are tied directly to the nearest marker.
Heard on the job
Dispatch, we've a disabled tractor-trailer on I-80 eastbound just past milepost 142.
Insider tip
While GPS has made them less prominent for everyday navigation, highway patrols and tow trucks still rely heavily on them for dispatch accuracy.
Also heard as
- mile marker