My regular commute route is probably 4-5 miles longer round-trip than the shortest possible route. Safety is the biggest factor in my route, which avoids roads with heavy traffic and narrow lanes. It just so happens that my route is more scenic because I am riding through neighborhoods much of the way rather than commercial business districts. Occasionally I go way out of my way and pick up one of the local greenways, which adds about 10 miles to my afternoon commute, and I do that for the scenery as well as the extra miles.