Cars come off of SB Crowchild or EB Bow Trail, turn immediately on 19 St and then continue on 12 Ave. There are no lights or stop signs so I guess that traffic is mainly noticeable on 12 Ave. There is a similar situation with 11 Ave and 18 St, although there is a traffic light.
The 10 Ave connection is the whole reason for the 11/12 Ave one way couplet. If it really is low volume, it seems like there is a great opportunity to close access from 10 Ave, eliminate a bunch of ramps, save maintenance costs, and restore two-way streets. But the story of the last 10 years (since the west LRT opened) has been to tweak this area for higher traffic volumes. Anyone remember that weird shirt-lived half circle ramp near 18 St?