Using Longitude & latitude to create location base...

I am working on crash data from Source Signal4. I have attached sample data picture for reference. So I am trying to create a report where I can locate multiple crashes between 500ft radius. I have longitude & latitude of each crash loaction. How do I create a map which will show me only location on a single roadway for e.g 5mile streach & show me hotspots where I have more that 5 incidents withing 500ft oof each other. I have used power bi for just few months & have understanding of how dax works but could'nt find any resolution for similar issue in community. This map helps me work on safety features for roadway strech.