Michael Andersen blogs for The Green Lane Project, a PeopleForBikes program that helps U.S. cities build better bike lanes to create low-stress streets.

A few months after Honolulu opened its first protected bike lane, it’s the latest to demonstrate a very consistent trend across the country: Almost every protected bike lane immediately cuts sidewalk biking by at least 50 percent.

From August 2014 (before barriers were installed) to February 2015 (after), the number of people biking on King Street (both directions, road bed and sidewalk combined) soared 71 percent.

And in the same period, says Honolulu bicycle coordinator Chris Sayers, the number of bikes on the sidewalk plummeted 65 percent.

That’s no big surprise, because someone biking on a sidewalk is just trying to ride in the protected bike lane that isn’t there. When cities make part of a street comfortable to bike in, people naturally choose to use it.

That makes things better for everybody, Sayers said.

“It just sort of organizes the whole roadway better,” he said.

We’ve been in touch with bike coordinators around the country who’ve done similar counts, and compiled every such study we’re aware of into the chart below. Honolulu’s finding is strikingly consistent with the others, all of which saw between a 27 percent drop in sidewalk biking (L Street in Washington DC) to an 81 percent drop (Prospect Park West in Brooklyn, New York).

As you can see, those declines took place even though each protected bike lane dramatically boosted the total number of bikers. King Street is no exception. Sayers said riders have been so eager to use the lane, with its buffer of curbs, posts, and parked cars, that the city had to accelerate its plans to convert the bikeway from one-way to two-way operation.

On Monday, Mayor Kirk Caldwell personally installed the first of 13 bike-specific signals on King Street. The signals will complete the lane’s conversion to two-way.

“I think nobody anticipated it to be so many people, that the desire would be so strong to do the two-way immediately,” Sayers said. “We had to hurry up to get this done.”

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