I travelled on the NSE on last Fri from KL to Penang, there were 3 speed traps : 1st one near Bidor, 2nd one before Taiping turnoff ( 1st & 2nd were operasi where they stopped the cars on the highway) and 3rd one was under the bridge near Bukit Merah Lake Town (which used speed detector without stopping cars).
In the 1st speed trap, I was stopped for a good 30s before letting me go. The police looked up & down his list, probably could not believe that I was not speeding. In the 2nd speed trap, I was stopped & asked to pull over. An officer approached & asked me for driving license then went to rear of my car and had a look at the no plate.He returned to the driver side after that and before he could speak a word, I told him sternly that I wasn't speeding as I had used the cruise control (which was the fact), he just laughed, returned my driving license and waved me off. What a joker!
Some of these so call operasi, I believed they do not actually used speed detector. They probably judge by the type of cars you are driving and try their luck, hoping that you would fall for it. This is not the my 1st encounter of this sort, I had similar experience in the past at NKVE, Karak-Kuantan Highway, Kerinchi Link near Science Centre. So guys, know your right & don't just give in!