The signed bike routes don’t cross 670, they turn at 2nd and 1st (depending on direction) and enter downtown on Park St. Dale Hooper designated the bike routes when he was bicycle coordinator. I think they did a good job on the choice of roads. You can see the routes on the link in the previous post on this topic. I wish they were clearly marked on the MORPC bike map.
I should add that the bike route roads (Neil, Summit & Fourth) are geared towards vehicular cyclists. The roads you use (Hunter, Highland, Dennison) are fine roads, too. Someone else posted previously that the choice of roads is dependent on the cyclist’s comfort level, time of day, day of week…
All I was trying to say was that I think the city is looking at other neighborhoods, and rightly so, IMHO.