While Driving south on 99 just south of the Dole plantation, taking the 99 cutoff (staying on the 99) at the intersection of the 99 and 80 the speed limit changes from 45mph to 25mph which is posted twice to 45mph and then to 35mph all in the distance of about 1500 to 2000 yards. The police sit in unmarked vehicles on the right side at the junction of the 99 and the 801. The distance at which they are able to judge your speed is less than 300 feet. I was recently stopped here (42mph in a 25 mph zone) but was fortunate to have a camera. I photographed the area in question and was fortunate also fortunate to photograph the issuing office stopping a total of three vehicles in eleven minutes. I explained to the Judge that at best the posted speeds were confusing and that I was acellerating into the next posted area (45mph). I was pulled over 300 yards into the 45mph zone. The Judge took into account the 220 feet from whick my speed was recorded and dismissed the case.