It's not "breaking news" that cities outgrow their infrastructure. Nor is it news that streets and highways are among the MOST difficult to expand as the population expands.  Their pathways and "right of way"s (wonder if that's "rights of way" or "right of ways"...anyway, are defined and development occurs up agains them.  Consequently, virtually every city's growth will, at some point, outpace its capacity for vehicular travel.  Little Junction City is still trying to deal with Highway 99 which bisects the city and is the major influence on planning and growth.  Like it or not, vehicular travel is a huge influence on our lives.

The controversial and never-built West Eugene Parkway was designed to separate cross-town commuter traffic from local West 11th traffic.  It wasn't built and (I'm guessing  to no one's surprise) West 11th is a major area of traffic congestion.  IMO, there's no "easy fix" for Beltline/Delta and, if residential growth continues to the North..guess what  GaryCrum