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California Postmiles

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The Ghostbuster:
MOD NOTE: This post was originally made in replying to this post in the Westside Parkway/CA 58 realignment in Bakersfield thread. I thought it might generate other discussion, so split it out. óRoadfro.

Will California ever ditch the postmile system and implement a system with mileposts placed alongside the highways, like the rest of the country does? Somehow, I doubt it, but since the state first started adding exit numbers statewide in 2002, they should have posted milepost signs as well.

cl94:

--- Quote from: The Ghostbuster on March 21, 2023, 05:03:32 PM ---Will California ever ditch the postmile system and implement a system with mileposts placed alongside the highways, like the rest of the country does? Somehow, I doubt it, but since the state first started adding exit numbers statewide in 2002, they should have posted milepost signs as well.

--- End quote ---

Hahahahahahahaha, fat chance. In the places they have installed MUTCD-standard mileposts, said mileposts use...county mileage.

cahwyguy:

--- Quote from: The Ghostbuster on March 21, 2023, 05:03:32 PM ---Will California ever ditch the postmile system and implement a system with mileposts placed alongside the highways, like the rest of the country does? Somehow, I doubt it, but since the state first started adding exit numbers statewide in 2002, they should have posted milepost signs as well.

--- End quote ---

The simple answer is "no". The postmiles have a number of reasons for being retained: It provides a unique address for EVERYTHING on the highway within their digitized linear reference system; it doesn't require extensive reworking when a road is realigned or extended on either end (unlike posted mileposts). There is a statewide odometer. We go into this in great detail in the interview in our episode on state highway numbering, CARxR 1.07: Highway Numbering: State Highways and Post Miles, https://caroutebyroute.org/2023/01/16/carxr-1-07-highway-numbering-state-highways-and-post-miles/  See also https://postmile.dot.ca.gov/PMQT/documents/CALTRANS%20POSTMILE%20SYSTEM%20061016.pdf

Max Rockatansky:
The mistake people often make with Postmiles is assuming they intended for use for the average driver like mile markers are.  Like Daniel said, Postmiles provide addresses along State Highways which is intended mostly for use by Caltrans or other agencies.  As an example, Iíve found that if I given CHP a Postmile address they tend be able to dispatch with far more accuracy. 

Thatís not say I donít think there shouldnít be mile markers, they just serve different purpose than Postmiles.  Ideally I would like to see both in place.  I do agree with cl94 that having the mile markers based on the County is of limited use. 

cl94:

--- Quote from: Max Rockatansky on March 21, 2023, 06:50:51 PM ---Thatís not say I donít think there shouldnít be mile markers, they just serve different purpose than Postmiles.  Ideally I would like to see both in place.

--- End quote ---

Which is effectively the system NY has in place with its reference markers along freeways with normal mileposts, and to a lesser extent Nevada and Ohio along freeways with both postmiles and mile markers. Postmiles are for maintenance and emergency services, not the average driver. Though NV has been revising the postmile system to make more sense to your typical driver.

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