Three of my favorite golf courses are Tierra, Hacienda, and Mira Mesa, so although I live between the 6s, I travel the stretch fairly often.
It seems to me the safety issues could be addressed in a much more cost effective manor with a couple of changes.
#1. Strictly enforce the speed limit. Very likely this would provide a positive cash flow until cars learn to slow down.
#2. Alter the crossover southbound at the 466 gate. I can think of a few ways this might be accomplished, but a traffic study examining the best possible solutions could arrive at something at a much lower cost than making the entire run a separate MMP.
A tunnel would be expensive, but far more manageable than changing the whole stretch over to a MMP.
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