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[sprjus4]

Pembroke Pines is considering to be the first in the world with another innovative intersection, the center turn overpass
....

This one is extremely simple, it adds a grade separated structure for left turn movements meaning left turn phases at the main intersection can be eliminated.

Where, precisely? My brother-in-law lives in Pembroke Pines and I might ask him about if you know where it’s being considered (this because if he doesn’t know about it and asks where, I want to have an answer). My guess would be Pines Boulevard at Flamingo Road because there are so many crashes there.

SR 820 and SR 847 were two lanes back in the 80s. Little to no issues.  They expanded the lanes and now there is so much traffic that the lanes do no justice.  Expanding lanes is not a panacea.

Yes, I’m sure only 2 lanes would perform at a LOS A today... 

[Henry]

Having a separate level for left turns would be very cool to see, and a lot less complicated than those stupid continuous-flow intersections, which create so much confusion that the potential for crashing may be very high.

[Avalanchez71]

Having a separate level for left turns would be very cool to see, and a lot less complicated than those stupid continuous-flow intersections, which create so much confusion that the potential for crashing may be very high.

The vehicles still have somewhere to go.  You don't believe that this will cause confusion?

[Anthony_JK]

Having a separate level for left turns would be very cool to see, and a lot less complicated than those stupid continuous-flow intersections, which create so much confusion that the potential for crashing may be very high.

CFI's are no more confusing than DDI's, and the latter seem to be working out OK. Proper signage and pavement marking should do the trick.