Hold on, did you really try and pull a person over? You can't actually be the police as much as you want to force your "knowledge" on other people. You're going to get yourself killed.
Not a Cop.
Just being 'Iowa Nice'.
It's a Thing.
Google it.
My guess is the other guy was an Out-of-State Transplant.
Not a Native.
All I did 'do', was pull up, along side, in the other lane, at a stop sign, roll down the window and talked to him.
Not uncommon here, if you got an issue, for folks, to pull up alongside and tell you, what it is.
Brake Lights most common. No yearly Auto Inspections.
Low tires are another.
Going to the grocery store, just last week. An older guy, older than me even, had a flat tire.
Said it had slow leak and he forgot about it. was bit cold, so I told him to go inside,
get a cup and I'd be back in a jiff, with my compressor.
less than 5 minutes later, I pull back in. 2 much younger, healthier, guys come walking out, with him.
One of those tiny floor jacks, sitting by the tire.
They'd notice they issue, talked with the guy. had the $25 K-mart jack, in the trunk
and if I wasn't back in 10, they were going to change it out, put on the spare.
They pumped it up, with my compressor and then followed him to the tire shop.
Since I was now running tight, on time, but still need to pick up a prescription,
I left my new truck, unlocked, and asked if they'd toss the compressor in, when done.
..
Typing all this up, reminded me.
Had a guy follow me directly home, once.
Followed me for a couple of miles, turning with me, before I noticed.
Thought about stopping, when I realized he as following me,
to see if I had a problem, but too close to home, where I could fix anything.
Pull in my driveway and got out.
So doe he, and, sure enough, a brake light was out.
Never thought anything of it, other than, I probably got a vehicle issue.
..
Answer your original question.
Yes, I have waved/pulled people over, doing 70mph, down the interstate.
Pull up alongside, honk the horn and wave my arms like I'm having a Seizure.
Never, not once, did anyone, not pull over and stop.
Actually have a sign, in my center console, with my phone number, in huge letters, now.
Sign's easier, Works like a Charm.
If they can fix it, on their own, then I just drive on.
If not, I will stop & help.
Had people follow me home, so we could fix the problem.
Left them, on roadside, went home and got whatever, and fixed it there.
Hauled them to the store, so they could buy whatever, to fix issue.
After that Tammy Zywiki Murder.
In a pouring down thunderstorm.
Truckers talking about this lone person walking along interstate
but all bundled up, against the cold and rain.
If it was a girl, they'd stop but could not tell.
I stopped and was college Girl, cars dead, on the Interstate.
Heading to my hometown. 100 miles away.
We drove back, 30 miles, to Iowa City, where she rented a U-haul trailer.
Loaded up her car with a Come-along I carry & towed it to Dealership,
near my home & her College.
Dropped trailer off, at local U-haul.
Dropped her off, at her College Dorm.
Poor Girl was terrified. This happened, couple years after Tammy Zywiki had been killed.
I knew nothing about it but saw this girl was very uncomfortable, accepting help and just being in the truck.
She told me the story.
I told had her use my cell phone, they were pretty rare, back then.
Call 9111.
Tell them what's going on and read off my Drivers License, to them.
Didn't think anything about, what if something happens to this girl, they are gonna come after me.
Never entered my head. Only thought was make this child comfortable.
When she got home, she called them and said she was safe at her Sorority.
She thought of calling the cops again. I never considered it, at all.
..
Holy Moly.
I've drank too much coffee, this morning.