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Mile marker 23 on US 36 in Delaware County, Ohio. It marks the location which is 23 miles from the Union County line. A highway location marker is the modern-day equivalent of a milestone. Unlike traditional milestones, however, which (as their name suggests) were originally carved from stone and sited at one-mile intervals, modern highway ...
Often, the exits are numbered according to the nearest milepost, known as the mile-log system. From the beginning of the Interstate system until the mid-2000s, most Interstate highways had markers every mile. Since that time, many states have installed more markers every 0.25 mile, every 0.2 mile, or in some metro areas, every 0.1 mile.
As highways are converted to mile-based exit numbers, sequential numbers will be posted on "Old Exit XX" placards on advance guide signs and gore signs for at least two years following the conversion. Mile-based exit numbers on I-4 in Volusia County, Florida, circa 2003. In this case, mile-based exits 111A and 111B had been sequential exits ...
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.
The Pennsylvania Turnpike uses both mile marker numbers and sequential numbers. Mile marker numbers are used for signage, while sequential numbers are used for numbering interchanges internally. The New Jersey Turnpike, including the portions that are signed as I‑95 and I‑78, also has sequential numbering, but other Interstates within New ...
Exit numbers on Interstate 4 in Volusia County, Florida. In this case, mile-based exits 111A and 111B had been sequential exits 53CA and 53CB, as the 'OLD 53CA' tab shows. On a road with distance-based exit numbering, the exit number (shown here on a gore sign) matches a nearby mile or kilometer marker.
Guide signs include highway route markers (shields), which are reassurance markers, interchange signs, including advance guide and exit signs, and mile markers. Advance guide and exit signs usually feature control cities or other locations to help direct drivers toward their destinations.
The State Route System in Alabama uses the standard numbering convention: odd numbers signify a north–south state route, and even numbers signify an east–west route. Often more than one route number shares the same roadway, so identifying which route the mile markers are for is often difficult.