It’s one of the biggest complaints of Road Warrior readers: Drivers illegally on their cell phones.

Starting today, hundreds of police agencies around the state, including the CHP and Petaluma police, are cracking down on drivers who violate the hands-free law. It’s a zero-tolerance crackdown; no warnings.

Petaluma’s crackdown will be today and Tuesdays. The CHP plans to do it the entire month.

The fine for your first cell-phone violation is $160 in Sonoma County, after you include all of the extra county and state fees. It jumps to $280 for subsequent violations, according to local court officials.