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The postmile markers indicate the distance a route travels through individual counties, as opposed to mile markers that indicate the distance travelled through a state. Multiple other states, including Nevada, Ohio, and Tennessee, use similar county-based mile markers on non-interstates, but use standard mileposts on interstate routes.
Interstate 295 was the first highway in Rhode Island to receive mile-based exit numbers, starting in November 2017. Mile-based exit numbers have been added to Route 146 as part of a sign replacement project. Conversion completed in November 2022, with I-95 the last remaining highway in the state. Texas: Late 1970s.
Typical mile marker used in the United States. In the U.S. Interstate Highway System, the numbers usually measure the distance to the southern or western state line, or the route's terminus, if the national southern or western terminus lies in that state.
On one- or two-digit Interstates, the mile marker numbering almost always begins at the southern or western state line. If an Interstate originates within a state, the numbering begins from the location where the road begins in the south or west. As with all guidelines for Interstate routes, however, numerous exceptions exist.
A mileage sign, as well as reassurance markers and mile post in the background, on the I-70 in Pennsylvania. Destinations on mileage signs are displayed from nearest at the top to furthest. Route numbers are not shown, instead being displayed on reassurance markers, which may or may not be located near to the mileage sign itself.
California uses a postmile highway location marker system on all of its state highways, including U.S. Routes and Interstate Highways. The postmile markers indicate the distance a route travels through individual counties, as opposed to mileposts that indicate the distance traveled through a state.
The first mile-based system known was implemented on the Garden State Parkway in New Jersey in the late 1950s. Michigan also implemented mile-based junction numbers on Interstate 94 in the 1960s. In this system, the number of miles from the beginning of the highway to the exit is used for the exit number.
The triangle marker design was the only design until November 1983, when Tennessee divided its routes into primary routes and secondary or "arterial" routes with the adoption of a functional classification system, creating a primary marker and making the triangle marker the secondary marker; primary marker signs were posted in 1984.