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Chapter 7 _2_ - Intersection Control and Signalization...

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Intersection Control and Signalization: Concept and Analysis Control conflicting traffic and pedestrian movements at grade crossings
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ECI 161 Winter 12 Signalized Intersection Analysis Two approaches: square6 Deterministic arrivals (Use D/D/1) square6 Probabilistic arrivals (Use empirical equations) Quantifying delay: Delay can be expressed as Total delay in vehicle-hours or person-hours Average delay per vehicle (seconds per vehicle)
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ECI 161 Winter 12 D/D/1 Signal Analysis: λ C > μ g (Oversatuaration)
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ECI 161 Winter 12 Arrival Rate Departure Rate Time Vehicles Maximum delay Maximum queue Total vehicle delay per cycle for the lane or the group of lanes Red Red Red Green Green Green Queue dissipation D/D/1 Signal Analysis: λ C< μ g (undersaturation) μ μ λ
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ECI 161 Winter 12 square6 Time to queue dissipation square6 Proportion of the cycle with a queue square6 Proportion of vehicles stopped μ λ ρ = 0 . 1 < ρ ( 29 ρ ρ - = 1 r t c C t r P c q = ( ( 29 q c c s P C t r g r t r P = = + = λ λ ( ( 29 C t C t g r t r P c c c s ρ λ μ λ λ = = + = D/D/1 Signal Analysis: λ C< μ g
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ECI 161 Winter 12 square6 Maximum number of vehicles in a queue
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