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On this week\u2019s episode, Chuck talks with Dr. Shima Hamidi of the Johns Hopkins Bloomberg School of Public Health, who, in November 2023, published a study on how wide lanes on urban streets promote more crashes, whereas narrower lanes\u2014as narrow as nine feet\u2014are safer. The findings of this paper cut into the core assumptions of the civil engineering profession in regard to traffic design. Strong Towns wrote about the study when it first came out, and we\u2019re excited to now have Dr. Hamidi on the podcast to tell us about her work, in her own words.\nADDITIONAL SHOW NOTES\n\nRead the study: \u201cA National Investigation on the Impacts of Lane Width on Traffic Safety.\u201d\n\n\nCheck out the study\u2019s homepage.\n\n\nShima Hamidi (Twitter/X).\n\n\nChuck Marohn (Twitter/X).