ITE Journal - June 2021 - 22

| ethics forum

Citywide Speed Limits

Shutterstock/Adhitama

The elected leadership of a mid-sized city proposes to take steps towards implementing a
recently adopted Vision Zero goal by adopting a citywide maximum speed limit of 25 miles
per hour (mph) (40.2 kilometers per hour) to provide better protection for pedestrians and
bicyclists, after an increase in pedestrian and bicycle crashes in the past two years. The city's
leadership is familiar with some of the concepts related to Vision Zero, have consulted with
their peers in other Vision Zero communities, and believe a citywide maximum speed limit is
the proper solution. Ms. Dudley, the city traffic engineer, is faced with three choices: accept
and implement the decision; advise the mayor and city council of the anticipated impacts
(positive and negative) of such a decision; or prepare a full engineering analysis and report
to address the issue. Ms. Dudley is fully supportive of the safety goals of the city council's
proposal, but is worried about limited compliance, the need for increased enforcement, and
whether a citywide speed limit is sustainable as a long-term solution to the community's
safety concerns.
Ms. Dudley chooses to perform an engineering analysis and prepare a report addressing
the issue and providing recommendations. Within the report, she does an analysis of the
crash history, particularly those involving pedestrians and bicyclists. The city's crash database
shows some of the vehicle, pedestrian, and bicycle crashes are types that could likely be
reduced with roadway modifications. She also notes the main thoroughfare bisecting the

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ITE Journal - June 2021

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