Another speed trap shut down

The article mostly talks about the clerks taking the money, which they should be jailed for obviously. But, were the people actually speeding? A lot of people claim a speed trap when they get a ticket. Yes, I'm a retired police officer and wrote many speeding tickets while sitting in "plain view." We had so much traffic though where I worked and believe it or not, I didn't stop a vehicle unless they were going 15 mph over the limit. I think that's generous. It wasn't uncommon to have drivers go 90+ on the freeway. I know RV drivers don't go that fast but if they're stopped for going 5 mph over, that's not right. Maybe that's what they were stopped for, I just need more facts.