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. Watch this video ad-free and sponsor-free on Nebula! https://nebula.tv/videos/notjustbikes-what-is-the-correct-speed-limit Patreon: https://patreon.com/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/ref_mats/fhwasa1304/Resources3/08%20-%20The%20Relation%20Between%20Speed%20and%20Crashes.pdf 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/21094293/ NACTO - Impact Speed and a Pedestrian’s Risk of Severe Injury or Death https://nacto.org/wp-content/uploads/2017/11/2011PedestrianRiskVsSpeed.pdf 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/articles/PMC4288294/ Stopping Distance Calculator https://www.omnicalculator.com/physics/stopping-distance New crash tests show modest speed increases can have deadly consequences - IIHS News https://www.youtube.com/watch?v=tZChyjaqNBI Speed and the Laws of Physics Société de l'assurance automobile du Québec https://web.archive.org/web/20221108022042/https://saaq.gouv.qc.ca/en/road-safety/behaviours/speed/laws-physics 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/Resources/reactiontime.html The Effect of Driving Speed on Driver’s Visual Attention: Experimental Investigation https://link.springer.com/chapter/10.1007/978-3-319-07515-0_18 Zhang, W., & Peterson, M. (2011). Predicting Patterns of Potential Driver Distraction Through Analysis of Eye-Tracking Data. http://onlinepubs.trb.org/onlinepubs/conferences/2011/RSS/program.pdf Why Speeding – Just a Bit – Can Be Dangerous ARCON Forensic Engineers https://arconforensics.com/system/ckeditor/attachment_files/184/the_dangers_of_speeding.pdf Serious Injuries 2018 - European Road Safety Observatory https://road-safety.transport.ec.europa.eu/system/files/2021-07/ersosynthesis2018-seriousinjuries.pdf 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/rapporten/680300009.pdf 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/slowing-city-traffic-cut-road-deaths-by-a-quarter No generative AI or AI voices were used in the making of this video --- 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 7:36 Visual Perception 8:57 SMIDSY 9:29 Overconfidence 9:52 "That guy" 10:17 Mobility vs Safety 11:04 Faster and Slower 12:22 Too Much Traffic? 13:04 Brainerd Traffic Lights 14:47 Removing Traffic Lights 15:53 Painfully Inefficient Stroads 16:29 Building Great Streets 17:27 Fuel Efficiency 18:30 The Benefits 19:44 Conclusion & Assholes 20:17 Ground News Corrections: 3:48 the car shown is a Ford Focus but the fact about the Fiesta is correct 10:42 this is the colloquial (not mathematical) definition of "inflection point", synonymous with "turning point" or "uptick" 17:32 lower speed limits actually results in better fuel efficiency in the city due to regular acceleration and braking, so it's even less of an issue