MileOn allows you to choose from PC*MILER's three standard route types to generate routing for your trip. 

Practical routing (default) minimizes time and cost. Practical Routes consider distance, road quality, terrain, urban/rural classifications, truck-restricted roads, and designated principal and secondary through routes.

Shortest routing minimizes total distance traveled while still following a reasonable route. For example, Shortest route mileage and routes will still avoid truck-restricted roads and, in some cases, may favor a beltway rather than traveling directly through a city. (Premium only)

Fastest routing uses real-time or historic traffic data to calculate the quickest route. Users who ship time-sensitive freight can select a Fastest route that may be longer in distance but save time over the standard Practical route. (Premium only)