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Transportation and Infrastructure Planning Flashcards

7 cards from real ASCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Under the Greenshields linear speed-density model, maximum flow occurs at what density?

    Answer: One-half of jam density

    Greenshields' parabolic flow-density curve peaks at k = kj/2.

  2. A freeway lane has a free-flow speed of 60 mph and a jam density of 200 veh/mi. Using Greenshields' model, what is the lane capacity?

    Answer: 3,000 veh/h

    Capacity = vf × kj / 4 = 60 × 200 / 4 = 3,000 veh/h.

  3. An approach carries 1,800 veh/h, with a peak 15-minute volume of 500 vehicles. What is the peak hour factor?

    Answer: 0.90

    PHF = 1,800 / (4 × 500) = 0.90.

  4. Which statement about space mean speed is correct?

    Answer: It is the harmonic mean of spot speeds over a point

    Space mean speed is the harmonic mean of spot speeds and is less than or equal to time mean speed.

  5. Under the Highway Capacity Manual, which measure defines level of service on a basic freeway segment?

    Answer: Density in pc/mi/ln

    The HCM uses density in passenger cars per mile per lane as the LOS measure for basic freeway segments.

  6. Upstream flow is 1,500 veh/h at 30 veh/mi. Downstream flow is 1,000 veh/h at 100 veh/mi. What is the shock wave speed?

    Answer: -7.1 mph

    Shock wave speed = (1,000 − 1,500)/(100 − 30) = −7.1 mph, so the wave moves upstream.

  7. Which speed statistic is most commonly used as the basis for setting posted speed limits?

    Answer: 85th percentile speed

    The 85th percentile operating speed is the traditional basis for speed zoning in the MUTCD.