I grew up in NYC and learned to drive there. I didn't start riding motorcycles until long after I left the area. Lanes are narrow, drivers aggressive, and for the most part when driving I do NOT look in my rear view mirror, leaving it for the drivers behind me to watch out for me, not the other way around. Riding on the Belt Parkway in Brooklyn, with heavy highway speed traffic, the lane splitting seemed excessively dangerous in my view. Several of my relatives that I spoke to during this recent visit remarked how they really dislike motorcycles and motorcyclists because they ride so dangerously. Makes me especially glad that I left NYC a long, long time ago and never returned to live there.