California is absolutely irrelevant.
Let's start out by asking why you think that the speed survey (or lack thereof) is even available as a defense in New York. Can you cite the New York law that requires it?
https://www.dot.ny.gov/mutcd
Section 1A.07, “23 CFR 655.603 also states that traffic control devices on all streets, highways,
bikeways, and private roads open to public travel in each State shall be in substantial conformance with
standards issued or endorsed by the Federal Highway Administrator.”
2B-13 of the MUTCD says:
“Speed zones (other than statutory speed limits) shall only be established on the basis of an engineering
study that has been performed in accordance with traffic engineering practices. The engineering study shall
include an analysis of the current speed distribution of free-flowing vehicles.”
The “Manual of Transportation Studies”, and the “Traffic engineering Handbook”, (both
recognized by traffic engineers throughout the U.S as THE manuals on how their jobs are to be conducted),
both state that a speed survey should be conducted every 5 years OR LESS. This has been upheld in CASE
LAW, as the NATIONAL standard.
Page 2B-13 (#12), “When a speed limit is to be posted, it should be within 5 mph of the 85thpercentile
speed of free-flowing traffic”