“San Francisco’s Shared Lane Pavement Markings: Improving Bicycle Safety” is a study and report produced by Alta Planning + Design.
Figure 5 from the report shows bicyclists next to parked cars with doors closed. The investigators noted only that bicyclists rode a few inches further from the side of cars with the marking present. I added 2’6″ wide red doors to show that the bicyclists would have struck them.
Critique of “San Francisco’s Shared Lane Pavement Markings: Improving Bicycle Safety” HERE shows that this study is not credible research and has numerous flaws and biases.
But based on this faulty study, the Bicycle Technical Committee and the other members of the National Committee on Uniform Traffic Control Devices specified an inadequate 11’ minimum placement when next to parking for the Shared Lane Marking in the 2009 Manual on Uniform Traffic Control Devices (MUTCD). Moreover, the lateral placement Guidance for roads without parking is also flawed.