No chance I'd be standing out to block any vehicle,nevermind a bike.Even at low speeds it would lead to seroius injury.Very sad stuff but likely avoidable.Most of the traffic corps lads are bikers themselves.
I've seen cops standing out in the middle of the road to stop vehicles but they don't know what the mindset of the driver is.Very risky stuff.If someone has a ban or no insurance they're not stopping for a yellow jacket.