More information on the curb extensions (bulb outs) being installed on the northeast and southeast corners of the intersection of 19th Street and O Street, as part of the Central City Mobility Project. I questioned this location for curb extensions because 19th Street with have a parking protected separated bikeways on the left side (southbound) of 19th Street. (Central City Mobility update)
I received a response from the engineering firm for the project:
This is in response to your inquiry as to compatibility of the subject intersection revisions and parking protected bike lane. The design does account for the bulb outs at the intersection. Unfortunately, due to the space restrictions resulting from the bulb outs, it won’t be possible to provide parking protected all the way around the bulb outs. However, we are providing a transition of the bike lane at the intersection. Please take a look at the following striping design for the intersection. North is to the right with 19th Street running left to right. Hopefully this will give you a better feel for the plan:
Any reader of this blog will know that I love curb extensions. What confuses me is why this location would have been selected by the city over many other potential locations. Perhaps some of the reason it that the crossing at O Street has a moderately high walker count, but does not otherwise have a traffic signal or pedestrian signaling such as a RRFB. It is possible that the city thought these four corner curb extensions to be the most practical way of increasing safety for walkers and bicyclists crossing at this point.
The design of bringing the separated bikeway out adjacent to the general purpose travel lane, as a bike lane, is not ideal but not particularly unsafe. In fact some bicyclists prefer this design, because it increases the visibility of bicyclists by motor vehicle drivers, so that they are not ‘hidden’ behind parked cars. Though daylighting of the intersection approach can accomplish the same objective.
I would like to see green skip paint continuing through the intersection in the bike lane. These are often painted as discontinuous green rectangles with sharrows stenciled on top, called green-backed sharrows. The sharrows are out of favor with most bicyclists and some traffic engineers, I think this is a valid use of them. The main purpose of green paint (it has no legal meaning) is to increase driver awareness of bicycle facilities by highlighting conflict points, and this is definitely a conflict point.
A number of related posts are in the category: Central City Mobility Project.