Roadze brings together 52,325 public traffic cameras from 46 state transportation departments on a single map. Check the road before you drive: traffic, weather, construction and closures, from the same cameras the agencies publish. Free, with no account required.
Every camera is re-checked against its transportation department once a day, and cameras that stop working are removed. 533 highways and 188 metro areas have their own page, with the roads that cross them and how weather usually affects driving there.