Reduced speed signmeaning

In New York State, a large portion of the section in the National MUTCD on Speed Limit signs (Section 2B.13) has been replaced by new material in the NYS Supplement. Below are examples of the six speed limit signs available in New York State for most ground-mounted signs. For a school speed zone, the W3-5 sign is replaced by the S4-5 sign and the color shall be yellow-green.

The regulatory sign placed on the Reduced Speed Limit Ahead Signs (R3-5) shall be identical to the next regulatory speed limit sign. The R3-5 sign should be used anytime the speed limit drops by 15 or more miles per hour.