Every Street in Black Diamond is a speed trap. Speed limits randomly change back and forth from 25-35 MPH along the same street. They sometimes pull over and ticket individuals who are outside the city limits. Do not know if the tickets stick but I’ll bet they do. Be wary of driving through between midnight and 5 AM. Police cars will sometimes tailgate you with bright lights on hoping to push you over the speed limit. in nearly 40 years of driving I have been breathalyzed 3 times. All three in Black Diamond and I blew a 00,00 all three times.