The con­cept is detailed in a 2009 research paper by Peter Furth, civil engi­neering pro­fessor and bike infra­struc­ture expert at North­eastern Uni­ver­sity, who first came up with the idea.

The street mark­ings, he wrote, can help pro­vide the “feel” of a bike lane — even if there’s no room for one.

It is a design option for a ‘just-​​in-​​time’ bike lane with the poten­tial to offer bicy­clists a level of safety and com­fort that approaches that of an exclu­sive bike lane,” Furth wrote.

The “shar­rows on steroids” are rel­a­tively unprece­dented: Only a couple of other cities in the United States have tested them out.

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