Per a Chicago study, red light cams decreased T-bone accidents by 15% but rear-end collisions increased by 22%. What a gift to the trial lawyers. If it works like the van cams did (which were a disaster) all they will do is clog and slow traffic with some people afraid to even enter an intersection when the light is green and the way ahead clear. I've noted that some elderly drivers in retirement areas of California are overly cautious already, stopping for every green light just in case it turns yellow. I can imagine Hawaii would be even worse.