As part of the implementation of Iowa City’s Bicycle Master Plan, the city began enhancing roadway infrastructure by painting bike lanes, shared lane markings, and the new bike turn boxes.

The bike turn boxes, painted on Jefferson and Market Streets last week, are designed to prevent conflicts between motorists and bicycles at busy intersections.

“Let’s say you want to go left on Madison and you’re not comfortable riding in traffic,” Assistant Transportation Planner Sarah Walz said. “What you would do is just continue through the light. And then there’s a green box where you can stop and wait… but you’re protected by the curb. Then you would just wait for the light to go green on Madison, and then you’re out ahead of traffic and you can cross the street and get into [a bike lane].”

Iowa City adopted the Bicycle Master Plan in 2017, which is a document that guides city planners in fostering safe and equitable infrastructure for cyclists.

UI public-health Professor Cara Hamann, who studies transportation safety, said riding in the street is generally safer for bikers, and these types of infrastructure projects further enhance biker safety.

“Riding on the sidewalk makes bicyclists more prone to crashes with vehicles at conflict points like intersections and driveways because motorists are often not looking for or expecting to come across a bicyclist on the sidewalk,” Hamann said. “Bike lanes and bike boxes help keep cyclists safe on the road because they give the rider designated space.”

Avid Iowa City cyclists Michael Chamberlain and Asa Crowe expressed skepticism in the effectiveness of these painted-on infrastructure improvements without other education efforts.

“I don’t think the bike lanes or boxes alone will necessarily make it safer for cyclists because they add more to perceived safety while actually giving cyclists less room for error,” Crowe said.

Crowe, who works at local bike shop The Broken Spoke, added they grew up biking in rural Iowa on two-lane highways and gravel roads and shoulders — a much more dangerous setting compared to Iowa City’s roads.

Chamberlain, Broken Spoke owner, said he has a love-hate relationship with bike lanes.

“Bike lanes certainly encourage novice cyclists to start riding who otherwise wouldn’t… [but] the bike lane coming down Dodge Street is a prime example of an unsafe bike lane,” Chamberlain said.

He said bikers can easily maintain the posted speed limit of 25 mph going down the hill, but that a bike lane actually forces bikers into a narrower space that features two curves and is commonly obscured with debris.