Pedestrian thrown in jail for 12 hours for holding up sign warning drivers about police speed trap

A woman in Houston, Texas, was arrested and jailed for 12 hours after she held up a make-shift sign to warn drivers about a speed trap.

Natalie Plummer was officially charged with walking in the roadway -- jaywalking, essentially -- though she says the police officers who arrested her were just angry that she had tipped off speeders.

Miss Plummer was riding her bicycle along a road near downtown Houston on Thursday when she spotted police officers pulling drivers over.

She told KTRK that it looked like the officers were targeting cars at random, so she recorded some the activity on her cell phone.

Then, she said, she turned around and wrote 'Speed Trap!!' in large letters on a piece of grocery bag to warn oncoming traffic.

'I was simply warning citizens of a situation ahead,' she told the TV station...