HOW WE DO IT: We calculate the safety level of a commute based on the density of crashes along your route over the past year. The map is divided into a grid. The number of accidents to occur within a grid square are totaled and compared against the grid square with the highest number of accidents. Each grid square then receives a score based on how it compares to other squares. All squares along a route are totaled and averaged to create an average risk score. The grading scale for risk scores is a letter grade score on the scale of A-E. A is the safest that a route can be while E is the least safe a route can be.
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