In my area we can (and I have) call 911. At least when I called, they did take it seriously. But it involved two SMALL children buckeld in the front seat of a mini-van that had it's side door open. I'm sure there was an explanation and the driver was doing his best. But it was completely unsafe. (and yes, I have a wackly van that did go through a period of the door not remaining closed...I would have had it towed and repaired before driving it with my children even in car seats.)
If I can stop a tragedy, I will. In that case, I had to follow the car--911 was on the phone. I tracked it long enough until the cops found me, and then i directed 911 to the correct mini-van and they passed me and went after the mini van. They were headed towards the interstate and there was nowhere else to go but on it when they were pulled over. So I am glad I did intervene.
To me it isn't so much as ratting the person out as it is in getting the kids into safe transportation.
Not sure I would have called in your scenario. But if I sense imminent danger, I consider it reckless to remain silent.
Oh my word...the van was being driven with the SLIDING-DOOR OPEN?!?
Pardon me while I faint...
agnes!