Earlier quoted context omitted.
Maybe most people in Portland live outside of downtown. Or maybe Portland just has better traffic management. This route around downtown Portland Google estimates will take 22 minutes: https://www.google.com/maps/dir/45.49314,-122.6699199/45.492... This route around downtown and midtown Atlanta Google estimates will take 25 minutes: https://www.google.com/maps/dir/33.7440027,-84.4006901/33.74...
No way. The 285 around Atlanta is 66 miles long. The 5 and 405 around downtown Portland can be driven in under 10 minutes under ideal circumstances. Also, your google map link for Portland is bizarre. I honestly have no idea what that route is supposed to represent. It definitely isn’t any route someone would take who was trying to circle downtown Portland.
285 around Atalanta encloses forests and suburbs, a lot more than just downtown.