When a 3-Foot Clearance for Passing a Cyclist Is Not Enough

Sharrows and 3-foot passing laws are meant to make biking safer in streets in the absence of bike lanes. Bike activists in Iowa want to take safety a step further by requiring motorists to move to another lane, just as they would if passing a car.

2 minute read

February 28, 2016, 5:00 AM PST

By Irvin Dawid


The bill, known as "Change Lanes to Pass Bicyclists" or Senate File (SF) 2224 "would require motor vehicles to use the opposite side of the road or an adjacent travel lane to pass people on bicycles," states the legislative page of the Iowa Bicycle Coalition "It also recognizes that paved shoulders and bike lanes are adjacent travel lanes, and prohibits motorists from steering unreasonable close to people riding bicycles in those lanes."

Current Iowa law "prohibits motorists from driving 'unreasonably close' to cyclists," writes Molly Montag of the Globe Gazette. Last year 26 states plus the District of Columbia passed laws requiring motorists to pass no less than three feet from a cyclist, according to the National Conference of State Legislatures. 

state map of passing statutes

Credit: NCSL, Safely Passing Bicyclists Chart, 12/17/2015

"Approximately half of Iowa cyclists killed in the past 10 years have been hit during passing incidents, said Iowa Bicycle Coalition Executive Director Mark Wyatt," writes Montag.

“We want the law very crystal clear that you pass a bicycle like you would pass any other vehicle on the roadway,” Wyatt said.

SF 2224 passed the Transportation Committee, 12-0 and the Senate, 38-12, and now advances to the House, according to Iowa Bicycle Coalition webpage. The Iowa Chapter of the Sierra Club is supporting the bill [PDF].

Another safety strategy is to add sharrows to the asphalt along with roadway signs indicating to both cyclists and motorists that the both are to share the lane. While better than no such signs, many question their effectiveness to improve safety and increase cycling.

Credit: Bike Arlington

Photo: sharrows








Readers can listen to a 49-minute talk with Mark Wyatt on bike culture in the Hawkeye State on Iowa Public Radio. The "Talk of Iowa" show was aired last September followed the tragic death of a cyclist by a drunk driver.

Hat tip to AASHTO Daily Transportation Update.

Tuesday, February 23, 2016 in Globe Gazette

Young Professional

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban and Environmental Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban and Environmental Planner

Get top-rated, practical training for planners

"Planetizen federal action tracker" logo superimposed over black and white image of US Capitol dome.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

25 minutes ago - Zachary Whalen

Overlapping highways

The state-sanctioned urbicide of Austin

People don’t kill cities. Freeways do.

September 8, 2026 - Benjamin Schneider

The Hoover Dam blocking the Colorado River. The river's water level is noticeably low. The cliffs surrounding the blue water are brown and jagged.

US to reduce Colorado River water deliveries to Mexico

A new Colorado Treaty amendment reduces Mexico’s Colorado River water allocation by 250,000 acre feet.

September 11, 2026 - The Arizona Republic

NYC Mayor Zohran Mandami speaks behind a blue podium.

Mamdani overhauls NYC's Vision Zero plan with 100 new policy goals

The overhaul aims to reduce traffic deaths and make streets safer for pedestrians, cyclists and drivers through lower speed limits, new safety infrastructure and more.

15 minutes ago - ABC 7 Eyewitness News

A New Jersey train approaches people waiting at the station.

Amtrak not solely to blame for New Jersey commuter rail's unreliability, report finds

A new study from the Garden State Initiative found that NJ Transit’s budget grew 20% across a 4 year period, but reliability declined significantly over the same period.

September 15 - Mass Transit

A tall, gray power plant billows smoke into a blue sky.

EPA erases limits on planet-warming pollution from power plants

Under Monday’s plan, power plants would still have some limits on how much mercury, arsenic and other contaminants they can emit.

September 15 - New York Times

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.