McGuinness Boulevard in Greenpoint, Brooklyn (near the Pulaski Bridge) has become a prime target area for speeding tickets, in both directions. The speed limit is 30. There are undercover vehicles checking you upon approach to and descent from the bridge. It's easy to go 50 or over since it looks and feels like a highway. Don't be fooled.
In another part of town (Harlem), traveling south along Broadway, approaching 125th Street, there is often a vigilant cop car parked on the left, under the overhead train. Not sure what they're looking for, but this downhill stretch offers an easy opportunity to go way over the speed limit.