A professor of civil engineering challenges the notion that traffic engineering is based on science in the podcast. Topics include the historical influence on safety standards, the relationship between speed limits and road safety, and the conflict between safety and traffic flow efficiency. The guest calls for a shift towards prioritizing safety in transportation design and discusses the evolution of traffic engineering perspectives over time.
Transportation system design lacks scientific basis, necessitating a shift towards safety-first mindset.
Traffic engineering metrics prioritize vehicle miles over safety outcomes, advocating for population-based measures.
Deep dives
Traffic Engineering Challenges Safety Assumptions
Traffic engineer Wes Marshall challenges the prevailing belief that transportation system design is based on science, emphasizing the need for a mindset shift to prioritize safety over capacity. Marshall's book, 'Killed by a Traffic Engineer,' critiques the industry's reliance on outdated manuals and emphasizes the importance of considering human behavior in road design.
Impact of Exposure Metrics on Safety Analysis
Marshall discusses the flawed use of exposure metrics in determining road safety, highlighting how current methodologies prioritize vehicle miles traveled over actual safety outcomes. He advocates for a shift towards using population-based metrics that align with traditional health indicators, allowing for more accurate safety assessments and comparisons.
Human Factors and Safety in Road Design
Examining the impact of human behavior on road safety, Marshall delves into the counterintuitive results of wider roads and shared spaces. He emphasizes the need to consider the human element in transportation planning and design, challenging traditional traffic engineering assumptions and promoting a shift towards more empirical and human-centric approaches.
Challenges with Safety Technology in Car Design
Marshall explores how advanced safety technologies in cars, while beneficial, can inadvertently lead to risky behavior among drivers. Highlighting instances where drivers rely excessively on alerts and cameras, he underscores the importance of maintaining the balance between technology-driven safety features and human judgment in fostering safer road environments.
Because it has the word “engineering” right in there, the field of traffic engineering is something most people assume is governed by science and rational rules. But a new book, written by a traffic engineer himself, argues that is not the case at all. In Killed by a Traffic Engineer: Shattering the Delusion That Science Underlies Our Transportation System, Wes Marshall — a professor of civil engineering at the University of Colorado Denver — says that the idea that the design of our transportation system is based on science couldn't be further from the truth. By examining a century's worth of history, studies, old professional journals and current standards, Marshall argues that his colleagues need to do some deep soul searching about the rules they follow so that they no longer design a system that kills tens of thousands of people per year.