FE Civil Exam Prep 75, Traffic Flow — Speed-Density-Flow and Greenshields

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FE Civil Exam Prep 75, Traffic Flow — Speed-Density-Flow and Greenshields

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This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The fundamental relationship of traffic flow is q = u·k, where q is flow (veh/hr), u is speed (mph), and k is density (veh/mile). - The Greenshields model provides a linear relationship between speed and density: u = u_f(1 − k/k_j), where u_f is free-flow speed and k_j is jam density. - Roadway capacity, or maximum flow (q_max), occurs precisely when speed is half the free-flow speed (u_f/2) and density is half the jam density (k_j/2). - A common exam trap involves recognizing that a single flow rate (other than capacity) can correspond to two different traffic states: one uncongested (high speed, low density) and one congested (low speed, high density). - Use the mnemonic "Max flow is at half and half" to quickly solve for roadway capacity without complex derivations. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

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