Why do both highway numbers appear on signs after two highways come together and do not separate again?

For instance in Texas state highways 24 & 19 merge south of Paris, Tx and they never separate again but road signs keep showing both highway numbers. There are several other cases of this event that I could cite. When 2 highways merge and never separate again why doesn't one of the highways simply end, especially if both are the same rank of highway(state, US, county, etc)and save money on road signs.

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  • Anonymous
    5 months ago

    You should spend your time wondering about things that have more importance.

  • 5 months ago

    Yeah, they do that a lot and not just in Texas.  Unless you're driving on an interstate or 400-series highway, just about any long road goes through name changes and combinations.

    A highway isn't exactly one stretch of physical road, it's kind of a route to a destination.  That's why part of the road is Hwy 24, then it merges with Hwy 69 and it's the 24-69 for a while, then it gets to Bald Knob and becomes Dillwinkle Street, then it becomes Hwy 69 for a while, etc. etc. etc.  And it's all the same stretch of pavement.

    The local expressway where I live is a perfect example.  Half of it is Hwy 7/8 East and West, the other half is Hwy 85 North and South.  But if you're travelling eastbound on the 7/8, it's just Hwy 7 after it splits off to the Hwy 8/401 bypass.  But if you're coming into town from Hwy 401, it's just the Hwy 8 bypass to Hwy 7/8 or Hwy 85 (which are all the same road).  You can also drive northbound on Hwy 85 while looking directly into the sunrise.  Confused yet?

    Come to think of it, even the interstates do that, because the bypasses around cities on I-75 are all called stuff like I-275.

  • 5 months ago

    They don't follow their original routes. They might have split again at one time in the past. Once the signs are already there, it doesn't save money to take them down.

  • 5 months ago

    That is a practise called “road multiplexing” where two separate route numbers join and share a common highway for part of their run.

    Although it appears to make no sense to maintain multiplexing where the two (or more!) routes will remain multiplexed all the way to the end, it is usually done because of different funding arrangements for repairs and maintenance to those routes. By keeping them multiplexed those costs remain shared. 

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  • ?
    Lv 7
    5 months ago

    Probably because each highway was authorized by a separate act of the legislature or Congress. They write a bill for a highway from city A to city B, then find that they could save money by combining part of that highway with another existing road.

  • 5 months ago

    Generally that should only happen when two highways merge for a period of time before separating again.  In your cited case though, it makes no sense as both 24 and 19 end outside of Paris.  So technically 24 should of simply merged with 19, as the remainder runs north / south meaning the odd number should take preference.

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