Arco Norte Robbery

I was last on the Arco Norte in February 2020. At that time I noticed a man watching traffic from overpasses out in the less populated areas. These men had some type of flag or cloth they would appear to use to signal others - not necessarily the traffic they were monitoring. We were traveling alone on a motorcycle so I was somewhat concerned about the intent. It might have been harmless and related to trucking but still it struck me - a 20 year visitor and traveler in Mexico - as something that could be worrisome.
Most if not all of these monitored overpasses had no exit or entrance ramps. I saw this at least 6 times at different overpasses in that area.