Trip mileage calculations are powered by PC*MILER, a product of ALK Technologies, Inc. Whenever possible, DAT Power displays actual road miles. When road miles are unavailable, Power will use air miles and the mileage will be displayed within parentheses, e.g. (245).
In PC*MILER, distances are calculated
by identifying the roads a vehicle will take between two points and summing the distances of each road section to
determine total mileage, similar to using an atlas.
Routes adjust to the nearest truck-usable road on the highway or local street network. This local distance is the
straight-line distance from the plotted point on the map to the closest truck-usable road.