The Mile Reference Posts dataset contains the physical location of milepost signs as they are located along the roads. This collection technique is different from linear mile point measures , opens in a new tab that are derived from a linear reference system (LRS). The advantage of this collection method is that the mile reference posts stay in roughly the same place over time and do not change when other sections of the road, or LRS, are realigned.

Mile reference post locations are derived from images captured by Mandli Communications , opens in a new tab , using on-the-ground asset collection technology. These locations were then aligned to UDOT's linear referencing system.

This data will be updated through on-the-ground collection every 2 years under the current contract. The data served on this page was captured in 2021 and reflects what was on the ground at that time.

The Mile Reference Posts is an ESRI Roads and Highways Event , opens in a new tab layer and supports the RP Stationing App , opens in a new tab .

Please reach out to Kelli Bacon from UDOT at kbacon@utah.gov with questions about this data layer.

Mile Reference Posts vs Linear Mile Point Measures

Mile Reference Posts

Mile Reference Posts are signs located in physical locations. They are helpful for navigation but may not reflect the linear referencing measurement.

Linear Mile Point Measures

Linear Mile Point Measures , opens in a new tab are calculated based on geometric lengths of data and are spatially accurate. They may or may not align with actual Mile Reference Posts and are updated every time a change is made in the spatial data to reflect updates in the physical location and length of the roadway.

For more information on the difference between mile reference posts and linear measures, please refer to UDOT's webpage , opens in a new tab addressing this topic or their informational document , opens in a new tab .

Fields worth noting

Legend

Milepost number on sign

Measure

Location of the milepost along the LRS

Station Label

Highway name + direction of route along LRS (P = positive, milepost numbers increasing; N = negative, milepost numbers decreasing) + milepost number. For example the value 0015PM_271 translates to mile marker 217 on Interstate-15 on the north bound (P) side.