Based on information researched at the time this page was created, the limited legality of speed cameras in Rhode Island is described below, and red light cameras are legal statewide in Rhode Island.
No other camera types should be mapped in Waze.
Speed cameras
Speed cameras are only allowed in school zones and are only turned on during school hours (7AM - 6PM). Currently, only the city of Providence are operating such cameras, with 15 cameras operating near schools throughout the city. While these are considered "mobile" cameras and can be relocated, the requirement to include warning signs to drivers of their existence means that they are generally stationary throughout the school year. Also, the city of Providence notifies the public whenever cameras are to be relocated before the start of each school year. As such, these cameras should be mapped in Waze, as it's better to warn drivers of an upcoming camera zone, even if that camera is sometimes turned off.
In these instances, look for the camera itself in Google Street View (see example) and map according to standard camera mapping guidelines. Note that this requires Google Street View to be up-to-date, so it may be difficult to properly identify new cameras without either updates to GSV, or boots on the ground.
Red light cameras
Currently, red light cameras are only in effect at 15 intersections in the Providence area, three intersections in Pawtucket, and two intersections along US-1 in Charlestown. To identify a valid red light camera, be sure to look for a sign near the intersection that says "Traffic Laws Photo Enforced", as shown on the right. As with speed cameras, you may need to either wait until GSV is updated, or have someone manually verify new cameras with photographic evidence before you can map them.