About a dozen people joined Natalie Plummer at a protest Saturday on West Dallas at Nash near downtown Houston.
Plummer says last month she was holding a sign at that intersection, warning drivers that a speed trap was just ahead.
She says she was arrested by two Houston Police Department officers for her warnings, but police say she was obstructing traffic by walking on the street.
Plummer says she was on the sidewalk and that the arrest was personal. She claims her First Amendment rights were violated.
Eyewitness News was the first to bring you Natalie Plummer's story last week. Her story has gone viral since then, with more than 7,000 comments on Yahoo as well as featured articles and coverage on AOL and The Drudge Report.
"I was standing up for all of them, because we're all citizens, we're all drivers," she said. "And pretty much the majority of us would like to know where there is a speed trap."
Plummer says she hopes the public support will lead to the charges being dropped, adding that she's working on filing a complaint against HPD.