EDIT: for some reason I was thinking Plymouth when you said Broadway. That’s what I meant.
Nowadays I just use a radar detector, especially going on highways. I have the following model… works like a charm
http://www.amazon.com/Escort-Passport-9500ix-Detector-Display/dp/B001F0RPGG/ref=sr_1_5?s=electronics&ie=UTF8&qid=1425937868&sr=1-5&keywords=police+radar+detector