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Author Topic: Why is there an Interstate 710, but no I-310 or I-510 in So. California  (Read 2503 times)

Phoenix#1867

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Whenever I look at a map of Los Angeles, I notice something odd.
Why is there an Interstate 710, but no I-310 or I-510 in So. California?
Were there supposed to be an I-310 or an I-510 in California? I so, why were they were canceled?
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DTComposer

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Since I-710 was previously CA-7, it was probably to provide some continuity for the public to remember the new number (the same way CA-11 became I-110).

Feel free to correct me, but I don't think there's any rule about assigning 3dis in any order (other than the even/odd assignments).
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mrsman

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There generally is no ordering rule for 3dis, but generally they would be signed in order of construction.  So 210 before 410 before 610.  But this is not a hard and fast rule.

And Caltrans doesn't really do a good job distinguishing between odd and even 3dis.  There are many roads that violate the rules in California, more so than in many other states.

The even x05s are signed geographically from N to S.  205 Tracy, 405 San Fernando, 605 Norwalk, 805 San Diego. But there is no rule that it has to be done this way.
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The Ghostbuster

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Here in Wisconsin, there is an Interstate 794 and an Interstate 894 in the Milwaukee area. Those numbers were likely chosen because in the Chicago area, there is an Interstate 294, two canceled Interstate 494s, and a canceled Interstate 694. There is a state highway 394, as well as a former state highway 194 (now Interstate 90 between Interstate 290/IL-53 and the Interstate 94 north junction), and a former state highway 594 (now Interstate 190, the O'Hare Airport Spur).
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mrsman

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Here in Wisconsin, there is an Interstate 794 and an Interstate 894 in the Milwaukee area. Those numbers were likely chosen because in the Chicago area, there is an Interstate 294, two canceled Interstate 494s, and a canceled Interstate 694. There is a state highway 394, as well as a former state highway 194 (now Interstate 90 between Interstate 290/IL-53 and the Interstate 94 north junction), and a former state highway 594 (now Interstate 190, the O'Hare Airport Spur).

Even though 3dis can repeat in new states, it is wise, if possible, to have different numbers when two metro areas are close together, like Chicago and Milwaukee.

Likewise, when the connector between DC 295 and 11th street bridge in Wash DC became interstate quality, the whole section of freeway between 395 and 295 was renumbered to I-695.  This led to some confusion with the existing Baltimore Beltway I-695 even though no part of DC I-695 reaches the state of MD.

CA does not have this problem.  It's big cities are very far from OR, NV, and AZ.  There is no confusion between I-215 in San Bernardino and I-215 around Las Vegas.
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OrangeLantern

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And Caltrans doesn't really do a good job distinguishing between odd and even 3dis.  There are many roads that violate the rules in California, more so than in many other states.

Let's see...

205 isn't a loop or a bypass around Tracy since it goes right through it.
305 isn't a loop or bypass but it's not signed so it doesn't matter really
505 is a bypass and not a spur
605 isn't a loop or bypass
710 isn't a loop or bypass
880 isn't really a loop or bypass at all


And there's 238 but everyone knows about that :rolleyes:
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sparker

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And Caltrans doesn't really do a good job distinguishing between odd and even 3dis.  There are many roads that violate the rules in California, more so than in many other states.

Let's see...

205 isn't a loop or a bypass around Tracy since it goes right through it.
305 isn't a loop or bypass but it's not signed so it doesn't matter really
505 is a bypass and not a spur
605 isn't a loop or bypass
710 isn't a loop or bypass
880 isn't really a loop or bypass at all


And there's 238 but everyone knows about that :rolleyes:


Technically a 2di should either be a complete loop or terminate at another Interstate at both ends.  That describes I-205 and I-605; the former originally was a rural connector (now inundated by exurban development) between I-580 and I-5 (pre-'64, it was intended to connect I-5W and I-5E), while the latter connects I-405 on the south to I-210 on the north, crossing I-5 and I-10 in the process.  It's an urban connector -- but it could be considered to be an eastern bypass of central L.A.  710, as an odd 3di, should have a terminal at a road or point other than another Interstate; it does just that on Terminal Island at CA 47.  880 is an urban connector like 605; it connects I-280 on the south with I-80 & I-580 on the north.  505 is an anomaly, as it does connect two trunk Interstates; pre '64 it was to be the northernmost segment of I-5W.  However, the 48-mile multiplex with I-80 prompted the redesignation, which was actually finalized in 1963 but its completed segments were renumbered in the field along with much of the rest of California highways in 1964.  The "505" number was selected for consistency with the other/southern segment of former 5W being designated as I-580 (i.e., both routes in the I-5xx grouping). 
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SeriesE

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And Caltrans doesn't really do a good job distinguishing between odd and even 3dis.  There are many roads that violate the rules in California, more so than in many other states.

Let's see...

205 isn't a loop or a bypass around Tracy since it goes right through it.
305 isn't a loop or bypass but it's not signed so it doesn't matter really
505 is a bypass and not a spur
605 isn't a loop or bypass
710 isn't a loop or bypass
880 isn't really a loop or bypass at all


And there's 238 but everyone knows about that :rolleyes:

205 bypasses downtown Tracy. The old route is 11th Street.
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