エピソード

  • FE Civil Exam Prep 77, Signal Timing and Pavement Design

    FE Civil Exam Prep 77, Signal Timing and Pavement Design
    2026/07/13
    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: - How to apply Webster's optimal cycle length formula, C₀ = (1.5L + 5)/(1 − Y), for signal timing problems. - The critical distinction between the 'Y' for the sum of critical flow ratios and the 'Y' for the yellow interval calculation, a common exam trap. - The purpose of the AASHTO Structural Number (SN) in representing the overall strength of a flexible pavement. - How to solve for a required layer thickness (D) using the formula SN = a₁D₁ + a₂D₂m₂ + a₃D₃m₃. - The importance of including drainage coefficients (m₂ and m₃) for base and subbase layers, a frequent source of error on the exam. 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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    4 分
  • FE Civil Exam Prep 76, Highway Capacity — LOS, PHF, PCEs

    FE Civil Exam Prep 76, Highway Capacity — LOS, PHF, PCEs
    2026/07/12
    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: - How Level of Service (LOS) A through F provides a qualitative grade for traffic conditions. - The correct formula for Peak Hour Factor (PHF) and how to apply it to find the design flow rate. - How to use Passenger Car Equivalents (PCEs) to account for the impact of heavy vehicles on capacity. - Common exam traps, such as inverting the PHF formula or misapplying the heavy vehicle adjustment factor. - Key factors that reduce a highway's free-flow speed, including lane width and lateral clearance. 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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    4 分
  • FE Civil Exam Prep 75, Traffic Flow — Speed-Density-Flow and Greenshields

    FE Civil Exam Prep 75, Traffic Flow — Speed-Density-Flow and Greenshields
    2026/07/11
    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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    4 分
  • FE Civil Exam Prep 74, Earthwork — Mass Diagrams and Shrinkage

    FE Civil Exam Prep 74, Earthwork — Mass Diagrams and Shrinkage
    2026/07/10
    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: - A mass diagram plots cumulative earthwork, where rising slopes mean cut and falling slopes mean fill. - Balance points on the diagram show where the total cut equals the total fill between two stations. - The difference between free haul (cost included in excavation) and overhaul (paid separately for longer distances). - How to apply the shrinkage factor to calculate the required bank volume from a specified compacted fill volume. - The definition of swell factor and its application in determining hauling capacity for loose soil. 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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    4 分
  • FE Civil Exam Prep 73, Vertical Curves — Crest vs Sag, K-Value

    FE Civil Exam Prep 73, Vertical Curves — Crest vs Sag, K-Value
    2026/07/09
    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: - How to correctly apply the K-Value formula (L = K*A) to determine the required length of a vertical curve. - The key design difference between crest curves (stopping sight distance) and sag curves (headlight sight distance). - How to calculate 'A', the algebraic difference in grades, and avoid the common exam trap of using decimals instead of percentages. - The precise formula to locate the high or low point of a curve and why it's rarely at the midpoint. - A memorable mnemonic to distinguish between the primary design criteria for crest and sag curves. 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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    4 分
  • FE Civil Exam Prep 72, Horizontal Curves — Degree of Curve, Stationing

    FE Civil Exam Prep 72, Horizontal Curves — Degree of Curve, Stationing
    2026/07/08
    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 difference between the arc and chord definitions for Degree of Curve, and which to expect on the FE Exam. - The correct formula to calculate the Tangent Length (T) and its role in locating the PC and PT from the PI. - The critical mistake to avoid when calculating the PC station: always subtract the tangent length from the PI station (PC = PI - T). - Why you must convert the intersection angle (delta) from degrees to radians when calculating the curve length (L). - The complete, step-by-step stationing process from a given PI to the final PT station (PT = PC + L). 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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    4 分
  • FE Civil Exam Prep 71, Geometric Design — Sight Distance, Superelevation

    FE Civil Exam Prep 71, Geometric Design — Sight Distance, Superelevation
    2026/07/07
    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: - How to apply the Stopping Sight Distance (SSD) formula from the NCEES FE Reference Handbook. - The critical sign convention for positive (uphill) and negative (downhill) grades in SSD calculations. - The purpose of superelevation in horizontal curve design and how to use the point-mass formula. - How to balance superelevation (e) and side friction (f) based on design speed and curve radius. - A simple mnemonic, "Uphill is a plus," to remember the grade sign convention for SSD. 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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    4 分
  • FE Civil Exam Prep 70, Lateral Earth Pressure, Bearing Capacity, Slope Stability

    FE Civil Exam Prep 70, Lateral Earth Pressure, Bearing Capacity, Slope Stability
    2026/07/06
    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: - How to differentiate between at-rest (K_0), active (K_a), and passive (K_p) lateral earth pressures and select the correct formula. - A mnemonic to remember that active pressure (wall moves Away) is smaller than passive pressure (wall Pushes). - How to apply Terzaghi's ultimate bearing capacity equation and find the N-factors in the NCEES Handbook. - The most common exam trap for bearing capacity calculations: inconsistent units for soil weight and footing dimensions. - Why slope stability questions on the FE exam focus on the conceptual Factor of Safety rather than complex calculations. 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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    4 分