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> I was surprised to learn that left turns account for "more than twice as many serious injuries and fatalities as right turns."

This may be because bike lanes are placed on the left side of major one-way avenues in Manhattan: https://www.google.com/maps/@40.8005797,-73.9618377,3a,75y,1...

I signal turns with my arm when biking, especially left turns. Otherwise I would be slowing and moving unpredictably, which doesn't seem safe. Unfortunately this isn't common behavior in NYC - even cars often fail to signal their turns, let alone cyclists.

> putting bike lanes between parking lanes and sidewalks

This is how all of the new NYC bike lanes work!

On major avenues in Manhattan, but not necessarily on side streets[0] or in other boroughs[1].

[0] - https://www.google.com/maps/@40.7740039,-73.9587169,3a,75y,1...

[1] - https://www.google.com/maps/@40.6757116,-73.9532197,3a,75y,2...