(CNN)The protesters met up at a gas station.
They taped signs on the sides of their cars and got ready to blare their horns.
Then they drove slowly down the street together.
The scene on a recent evening in Eloy, Arizona, about 60 miles southeast of Phoenix, was different than any demonstration Natally Cruz had joined before.
"I felt chills ... just to see how much support there is out there, to see how even at this hard time, people are still trying to find a way to help one another," says Cruz, who headed to the protest in her black Nissan Maxima with several signs in tow.
One said "honk for justice."
Unable to gather in large groups because of the coronavirus pandemic, pockets of protesters around the world are turning to a new tactic: trying to make their voices heard from inside vehicles instead of marching in the streets.
One focus of US protests: Immigrant detention
Last Friday in Arizona, organizers say some 200 cars circled outside the Eloy Detention Center and La Palma Correctional Center. For weeks, similar protests have been popping up outside immigrant detention centers across the country.
Advocates such as Cruz are pushing for Immigration and Customs Enforcement to release detainees, who they argue are particularly vulnerable to contracting the virus in crowded facilities that have long faced criticism for how they handle even routine medical care. ICE has said it's committed to caring for those in its custody and considering releases of some detainees on a case-by-case basis. So far there are at least 77 confirmed cases of Covid-19 among more than 33,000 detainees in ICE custody, according to the agency.