Prohibit left turns out of centroid connectors onto arterials

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This was something that worked well with the Geary network, so this is a 
possibility for easing gridlock.

Lower priority item but we can try this.

Original issue reported on code.google.com by lisa.zorn@sfcta.org on 2 Jul 2012 at 5:27

• Blocking: Declare calibration "Final" for the purposes of this project #151

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We should check with INRO about stop sign possibilities too; are vehicles 
coming from centroid connectors yielding to traffic already on the street?  Or 
does Dynameq act the same way as in an unsignalized intersection, which is that 
everyone takes their turn?

If the latter, we might want to implement stop signs to make the vehicles from 
centroids yield.

Original comment by lisa.zorn@sfcta.org on 13 Aug 2012 at 4:53

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Assigning to Renee because she already did an implementation (although I'm not 
sure if we're keeping it).

Original comment by lisa.zorn@sfcta.org on 24 Sep 2012 at 4:37

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Original comment by elizab...@sfcta.org on 26 Sep 2012 at 6:22

• Now blocking: Declare calibration "Final" for the purposes of this project #151