A Texas woman is claiming a violation of her First Amendment rights after she was locked up for trying to help drivers avoid getting pulled over.

FOX News Radio’s Chris Hoenig has the story:

Natalie Plummer says she spent 12 hours behind bars for holding up a sign warning Houston drivers of a speed trap.

(Plummer) “I felt like he was just pulling random cars over.”

She was riding her bike home from the grocery store when she saw the trap, so she stopped and stood on the sidewalk with a sign made from a paper grocery bag.

(Plummer) “I was simply just warning other citizens of a situation ahead.”

But cops arrested Plummer for obstructing traffic and walking in a roadway where there’s a sidewalk present. ¬†She disputes that and says she was targeted.

(Plummer) “I, for sure, did not step into the street.”

A police spokesman says she was in the road, making her a danger to herself and others, which is arrestable.

Chris Hoenig, FOX News Radio.

WATCH the legal debate over Natalie Plummer’s arrest HERE: