i'd love to see a safety heatmap layer, but the legal hurdles are probably massive. the second google puts a high risk badge on a specific road segment they open themselves up to lawsuits from local businesses or property owners claiming the algorithm is nuking their traffic or property value. it's probably going to stay in the hands of traffic engineers and underwriters for a long time.

Google is offering this as part of the geospatial platform that they market to governments for huge $$$ so I don't think you are going to get it for free any time soon. Maybe limited access if you have an Earth Engine developer account?