Try again. They are going to be reporting people driving within speed limit and stopping at red lights, then using this 'observation' to have leo detain people...
The LEO must make the PC observation...unless the MADD observer files a written complaint or insists on making a citizen's arrest. I doubt either of the latter will ever occur. The officer won't attempt to detain unless he/she can corroborate probable cause. To do otherwise would get the case tossed with ease.
The LEO that I accompanied for the "ride along" wouldn't write a speeding citation unless the vehicle exceeded 38 MPH in a 30 MPH zone. In the two years preceding when I did that ride along, he had written 300 speeding tickets. Only 2 were successfully challenged. Cops don't want to waste the time doing it wrong. They have to sit in court every time they write a citation.