I think M Awe is right about the definition of sharrows - they would only be found in lanes in which motorists are also allowed to travel (and not in dedicated bike lanes). Dedicated bike lanes usually have a stencil of a cyclists and an arrow, but not the chevron the sharrow has.
I never understand the objections to sharrows. They are akin to 'merge' signs where lanes lead in to each other and join. There was probably a time when 'merge' signs weren't necessary, then there were more vehicles on the road, and they became necessary to remind drivers to look out for other vehicles. Sharrows are just a reminder to motorists to expect cyclists on the road, and to remind cyclists not to ride next to parked cars.
By Hannah Sayle, Chris Herrington, Chris Shaw, Louis Goggans, Greg Akers, Bruce VanWyngarden, Jackson Baker and John Branston
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