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Introduction to Transportation Engineering
Instructor Dr. Norman Garrick Tutorial Instructor: Hamed Ahangari Feb. 2016
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Socio-Economic and Demographic
Land Use Socio-Economic and Demographic # Trip Trip Generation # Trip O-D Trip Distribution Mode Choice # of Trips by Modes Transportation Network Trip Assignment Traffic volumes
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Traffic Assignment
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Type 1 Given: Request Network Cost (Impedance) Short Path Tree
Short Path Sketch
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Example 1 1 Find the shortest paths from node 1 to all other nodes 2 7
6 4 2 3 5 7 9
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Total Impedance to Node j
1 6 4 2 3 5 7 9 Tree table from Node 1 Node ( j ) Total Impedance to Node j Node Preceding j 1 - 2 6 4 3 7 5 8
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Sketch of tree 2 1 7 3 3 5 3 4 3 4 6 3 9 2 3 5
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Type 2 Given: Request Short Path Tree Table Cost (Impedance)
Short Path Sketch
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Total Impedance to Node j
Example 2 Use the following minimum tree table from node A to sketch the minimum tree including showing the travel time. (Employ short path method) Node (j) Total Impedance to Node j Node Preceding j A - B 11 C 2 D 8 E 14 F 10 G 7 H I 15 J 25 K 18 L
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A 2 C 7 9 8 6 G B D F 8 2 5 L H 3 K I 10 J
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Exercise 1 Find the shortest path from node A to all other nodes 13 2
B 13 F 2 3 6 3 H A 5 D 2 6 2 4 2 C G 5 E 6
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Type 3 Given: Request Short Path Tree Table Cost (Impedance)
Trip Interchange Request Traffic Assignment
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Exercise 2 Origin Destination Trip Exchange A F 200 H 800 B E 250 G
700 250 A C E G 1000 1 3 2 700 6 2 3 9 6 4 950 5 2 8 800 B D F H 200
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Tree Table Node A Tree Table Node B
C E G D F H 7 2 8 3 9 1 4 Tree Table Node A Tree Table Node B Node (j) Total Impedance to Node j Node Preceding j A - B 6 D C 1 3 E 4 F G H 10 Node (j) Total Impedance to Node j Node Preceding j A 6 D B - C 3 E 9 F 4 G 11 H 12
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Travel Volume Shortest Path Links A-F 200 A D F AD-DF A-H 800 A C E G H AC-CE-EG-GH B-E 250 B D C E BD-DC-CE B-G 700 B D C E G BD-DC-CE-EG
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Traffic Assignment Link Trip A-F Trip A-H Trip B-E Trip B-G
Total Volume AD 200 DF AC 800 CE 250 700 1750 EG 1500 GH BD 950 DC
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Sketch of tree with allocated traffic:
G 800 1750 1500 200 950 800 950 200 B D F H
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