Sometimes I'm ok with the "stay on the freeway, even though it may be a bit longer due to traffic". Other times, I want to take every shortcut possible to shave a few minutes off my trip. The most aggressive setting might refresh every 2-3 minutes, and suggest non-traditional routes like alleys, service roads, neighborhood cut-throughs, and even parking lots, if there is any chance it will shorten the trip. A less aggressive setting (default) would keep you on easy-to-follow routes like freeways and major roads.