California has this: > Vehicles proceeding at a speed less than the flow of traffic and moving on a two-lane highway where passing is unsafe, must turn off the

California has this: > Vehicles proceeding at a speed less than the flow of traffic and moving on a two-lane highway where passing is unsafe, must turn off the roadway at the nearest place designated as a turnout or wherever sufficient area for a safe turnout exists, if a line of 5 or more vehicles forms behind them. https://www.dmv.ca.gov/portal/dmv/detail/pubs/hdbk/driver_handbook_toc/!ut/p/z1/hY6xDsIgGISfyPxYo0lH1IZW2rhVZCEgtZAqEKwdfHpJd-ttl3x3-YADA-7kZHs5Wu_kI_Ur3wlaHYt1SRAl2xojTMvy3BZtRvINXGYA_QhGwJf3p39AMshic2h64EGOZmXd3QMLb_UCZrQagOlopy4KI51W3g9i9LekxefjBbHwZJ96n1dfdmaJZA!!/?1dmy&urile=wcm%3Apath%3A%2Fdmv_content_en%2Fdmv%2B%2B%2Fpubs%2Fhdbk%2Fshr_slow_veh https://www.dmv.ca.gov/portal/dmv/detail/pubs/hdbk/driver_ha...