The day I was stopped on Sahuarita Road, there were no fewer than 6 motorcycle officers waiting to ticket drivers in that particular stretch. Since paying this ticket, I've found out that the signs advising drivers to slow down due to loose gravel did and do not constitute a legal speed limit. The motorcycle crew were doing a booming business on a road which had absolutely no loose gravel on it in the first place, and on which every single driver in my group of cars was stopped. I don't know if any of them found out about the legality of this situation before deciding to pay their tickets, but I hope somebody managed to avoid being charged a de-facto toll for driving on Sahuarita Road. I think everyone who may have paid for being caught in this trap ought to seek a refund.