This is great stuff. I love reading these route descriptions. Everyone is so different.
My 5.2 miles (8.3 km) is mostly on residential through streets. They have a fair amount of traffic, and cut through town, but it's all residential, and not a major thoroughfare. About 1 km (.6 mi) is on major streets (75th St and State Line Rd). My route is the most direct, and about the least hilly, so, cars or not, it's the way I would take.
Jonathan