I-70 W in Colorado

4runnerguy wrote:
All of the routes you mention take you through the suburbs of Denver. Traffic on I-25 and US 85 can both be very busy. Be warned that weekends in June and July those roads get very busy as the Renaissance Festival is near Larkspur south of Denver and traffic gets even worse. C-470 also gets backed up certain times of day on weekdays. IMHO, staying on I-70 is your best bet. Just avoid rush hour and things should flow smoothly, assuming there's not an accident, which can happen on any of the roads listed.

What Ken said.

That whole south part of the Denver Metro area has a lot of traffic seemingly all the time. Every time I've been down that way, regardless of the time of day, there's traffic. Keep in mind that the Denver Tech Center (a HUGE complex of offices and various businesses) is there as well as an Ikea store that generates a lot of traffic. There's also a lot of residential areas there in the Highlands Ranch/Centennial area and the attendant traffic. Additionally, there's light rail that runs down to that area, and so you'll have commuter traffic getting/to from the park and rides. Getting on C-470 won't really resolve any issues you may have with going through a city, as you'll be going through dense suburbs. This is true during the week as well as weekends. Also, there's a lot of folks that use C-470 to get to US 285 south -- recreational traffic on weekends, commuters heading back and forth to/from Evergreen and Conifer areas.