To junction or not to junction

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Re: To junction or not to junction

Postby AlanOfTheBerg » Fri Jan 18, 2013 6:13 pm

It is perfectly acceptable to have a single segment which does not junction with the other side of the road. Be sure and set the level to something different than the segment being "bypassed" in this manner.
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Re: To junction or not to junction

Postby AlanOfTheBerg » Fri Jan 18, 2013 7:29 pm

As it is now, using a slight angle results in only a "stay to the left" instead of a turn instruction. You can make your turn segment actually closer to the real turning location and make it near 90-degrees so the driver gets a "turn left." The driver should get at least two warnings about "turning left" so getting into a turn lane should be obvious to any competent driver. No need to create turn lanes, IMO.
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Re: To junction or not to junction

Postby AlanOfTheBerg » Fri Jan 18, 2013 8:36 pm

jasonh300 wrote:https://www.waze.com/editor/?zoom=7&lat=30.35935&lon=-89.42365&layers=BFTFFTTTFTTFTTTTFTTTTFT

This is a good example of one that works and gives a Turn Left instruction from either direction.

Oooh, pretties! :)

Does the southern end really give a "turn"? That angle looks pretty soft to me... :?:
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To junction or not to junction

Postby ArlenBystander » Fri Jan 18, 2013 6:07 pm

In the case of a dual carriageway with a left turn segment that should not permit a u-turn, is it a good practice to not have a junction node between the turn segment(s) and the segments of the opposite direction of the carriageway?

For illustration purposes, here's a Permalink with the two turn segments highlighted. All turns are properly restricted to route correctly but would it be better/worse to eliminate the junction and have the segments cross without connecting?

The biggest problem I see would be a system generated error should someone actually make a u-turn but that isn't much different than the other problems that get reported when there is really no problem.

Thoughts?
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Re: To junction or not to junction

Postby bigbear3764 » Sat Jan 19, 2013 12:40 am

Hey Joe, I cleaned that interchange up a little and gave the turns a kick to force the turn left instruction. I don't like these turn lanes either, another one of those I found that was done before I started, so I left it. If I don't see error reports or complaints, I'll leave them alone. If the ballons pop up, then the mower comes out.
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Re: To junction or not to junction

Postby jasonh300 » Fri Jan 18, 2013 7:20 pm

On those types of junctions with the crossed ramps (to prevent offramp to onramp routing), that's the only way I do it in Louisiana and Mississippi. By doing so, you eliminate the need for restricted turns in most cases. Less chance for something to be changed accidenally, and zero chance of routing against a restricted turn.
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Re: To junction or not to junction

Postby jasonh300 » Fri Jan 18, 2013 7:36 pm

https://www.waze.com/editor/?zoom=7&lat ... TTTFTTTTFT

This is a good example of one that works and gives a Turn Left instruction from either direction.
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Re: To junction or not to junction

Postby jasonh300 » Fri Jan 18, 2013 8:51 pm

AlanOfTheBerg wrote:
jasonh300 wrote:https://www.waze.com/editor/?zoom=7&lat=30.35935&lon=-89.42365&layers=BFTFFTTTFTTFTTTTFTTTTFT

This is a good example of one that works and gives a Turn Left instruction from either direction.

Oooh, pretties! :)

Does the southern end really give a "turn"? That angle looks pretty soft to me... :?:


Oops..no it didn't. I probably did that one before I figured that out. It will now.
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