Susan asked: I am researching Sharrows to create a report on their efficacy for the Philadelphia streets department. The Department has asked us to create criteria and a publicity campaign. I noticed reference to your citing “state statutes and lane width requirements for sharing vs. controlling”.
I think this concept of when a bicycle shares vs. controls a lane would be helpful for us to discuss in our criteria. Can you give me more details about your state statutes and requirements?
The use of Sharrows and Bicycles May Use Full Lane signs is based on the statutes that define a “substandard-width lane” as too narrow for a motor vehicle and a bicycle to safely travel within the same lane.
By definition, it is necessary for an overtaking motorist to at least partially change lanes to pass a bicyclist, even if the cyclist is far right in the lane. This is discussed in detail in this post:
There is much more in the posts under the tags “substandard-width lanes”, “lane position”, ”narrow lanes” and “impeding traffic” in the tag cloud.
This post discusses Sharrows and BMUFL signs in one location and the public awareness campaign that was conducted:
The use of these devices is new in Florida and there are only a few such installations. Separately, I will provide you with contacts that may offer more information about the experience regarding their application.