When I was in High School I used to do this. If I saw a radar trap I would go down the road and put up a sign that said “Radar Trap Ahead”. Either that or I’d go around and then drive down the street going about 15 miles per hour below the speed limit with a trail of cars behind me who would all change their tunes about me being a road hog when they’d see the radar cops. I’d wave at the cops as I crawled on by their trap.
The fact that they would call her actions “obstructing justice” is a joke. If she was on the sidewalk like she claims, then she was perfectly within her rights to warn motorists of a potential pick pocket ahead.
There are police jurisdictions here in our rural area where a speeder getting pulled over is a rare event. There are others that are legitmately called “traps”.
I have no problem with busting up a speed trap. It should be done more often.
I wouldn’t give some of our towns a hard time, though. If they have one of their very few policemen watching speeds, it’s because they’ve been told there’s a problem.
But not everyone lives in a rural town/village.