FHWA and NHTSA recently published an updated Speed Safety Camera Program Planning and Operations Guide. This update emphasizes speed safety cameras (previously known as automated speed enforcement, photo enforcement or photo radar) as a component of a comprehensive speed management program, integrating equity and transparency throughout program planning, operations, and evaluation.
 
Speed safety cameras can be an effective tool to protect vulnerable populations in many areas, including in school zones and work zones. The cameras have been shown to reduce crashes up to 54% in various applications using fixed, mobile or point-to-point applications. New York City found the use of fixed units in school zones reduced speeding up to 63% during school hours.

See the guide here