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How frequently are round-trip distances different, and how large can the differences be? Most differences in round-trip distances are small and are due to physical constraints in the road network such as differences in the length of ramps (a gentle 90-degree ramp is shorter than a 270-degree cloverleaf for the same maneuver). "Shortest" routes will rarely be more different than that, unless partial interchanges or one-way streets are part of the route. "Practical" routes can have larger differences because they consider travel time and tolls in addition to distance. When the travel time on a shorter non-interstate route is very nearly the same as on a longer interstate route, factors such as sharp turns and ramp distances are "tie breakers" causing routes to differ considerably in the two directions. | |||
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