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What is the "Correct" Speed Limit?

Compare news coverage. Spot media bias. Avoid algorithms. Try Ground News today and get 40% off your subscription by going to https://ground.news/notjustbikes. There's a trend towards lower speed limits in cities all over the world, but why is this happening? What is the research behind it? And what is the "correct" speed limit for cities, anyway? Watch this video ad-free and sponsor-free on Nebula! https://nebula.tv/videos/notjustbikes... Patreon:   / notjustbikes   Mastodon: @[email protected] NJB Live (my live-streaming channel): @njblive --- References & Further Reading Confessions of a Recovering Engineer Charles "Chuck" Marohn https://www.confessions.engineer/ SWOV Fact sheet - The relation between speed and crashes https://safety.fhwa.dot.gov/speedmgt/... Rosén, E., Stigson, H. & Sander, U. (2011). Literature review of pedestrian fatality risk as a function of car impact speed. In: Accident Analysis and Prevention, vol. 43, nr. 1, p. 25-33. https://pubmed.ncbi.nlm.nih.gov/21094... NACTO - Impact Speed and a Pedestrian’s Risk of Severe Injury or Death https://nacto.org/wp-content/uploads/... Nilsson, G. (1982). The effects of speed limits on traffic accidents in Sweden. In: Proceedings of the international symposium on the effects of speed limits on traffic accidents and transport energy use, 6-8 October 1981, Dublin. OECD, Paris, p. 1-8. Kinetic energy management in road traffic injury prevention: a call for action https://www.ncbi.nlm.nih.gov/pmc/arti... Stopping Distance Calculator https://www.omnicalculator.com/physic... New crash tests show modest speed increases can have deadly consequences - IIHS News    • New crash tests show modest speed inc...   Speed and the Laws of Physics Société de l'assurance automobile du Québec https://web.archive.org/web/202211080... Shaffer, D.M., Maynor, A.B. & Roy, W.L. The visual perception of lines on the road. Perception & Psychophysics 70, 1571–1580 (2008). https://doi.org/10.3758/PP.70.8.1571 Driver Reaction Time Marc Green - Human Factors & Science https://www.visualexpert.com/Resource... The Effect of Driving Speed on Driver’s Visual Attention: Experimental Investigation https://link.springer.com/chapter/10.... The Critical Ten - Stgreets.mn https://streets.mn/2015/04/02/the-cri... Zhang, W., & Peterson, M. (2011). Predicting Patterns of Potential Driver Distraction Through Analysis of Eye-Tracking Data. http://onlinepubs.trb.org/onlinepubs/... Why Speeding – Just a Bit – Can Be Dangerous ARCON Forensic Engineers https://arconforensics.com/system/cke... Serious Injuries 2018 - European Road Safety Observatory https://road-safety.transport.ec.euro... Svenson, Ola (February 1981). "Are We All Less Risky and More Skillful Than Our Fellow Drivers?" (PDF). Acta Psychologica. 47 (2): 143–148. doi:10.1016/0001-6918(81)90005-6. McCormick, I. A.; Walkey, F. H.; Green, D. E. (June 1986). "Comparative Perceptions of Driver Ability: A Confirmation and Expansion". Accident Analysis & Prevention. 18 (3): 205–208. doi:10.1016/0001-4575(86)90004-7. PMID 3730094. E. Verheijen and J. Jabben, Effect of electric cars on traffic noise and safety, RIVM report 680300009/2010, http://www.rivm.nl/bibliotheek/rappor... Alexander RG, Macknik SL, Martinez-Conde S. Microsaccades in Applied Environments: Real-World Applications of Fixational Eye Movement Measurements. J Eye Mov Res. 2020 May 15;12(6):10.16910/jemr.12.6.15. doi: 10.16910/jemr.12.6.15. PMID: 33828760; PMCID: PMC7962687. Slowing city traffic cut road deaths by a quarter https://www.ed.ac.uk/news/2022/slowin... Too Fast, Too Furious: New York City’s Speeding Epidemic https://transalt.org/reports-list/too... --- Chapters 0:00 Intro 0:45 False Start NJB Logo 0:51 Real NJB Logo 0:56 Why 30km/h? 1:33 Noise 2:27 Kinetic Energy 3:33 Mass 4:24 Microcars 5:08 Walking & Cycling 6:15 Avoiding Crashes 7:39 Visual Perception 9:00 SMIDSY 9:29 Overconfidence 9:55 "That guy" 10:20 Mobility vs Safety 11:07 Faster and Slower 12:25 Too Much Traffic? 13:07 Brainerd Traffic Lights 14:50 Removing Traffic Lights 15:56 Painfully Inefficient Stroads 16:32 Building Great Streets 17:30 Fuel Efficiency 18:33 The Benefits 19:47 Conclusion & Assholes 20:20 Ground News