Use free open govement data from STRADA (Swedish Traffic Accident Data Acquisition) improve data on current route to give heads up, ”This route has more reported accidents than a average route”
https://www.transportstyrelsen.se/sv/vagtrafik/statistik/olycksstatistik/om-strada/

There is allso a open data on game accidents on the road, https://www.viltolycka.se/ so Waze colud give heads up on current road, ”There is a high game accident rate on current road at this time of rhe day”