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9 Cards in this Set
- Front
- Back
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Grid |
Open ended network Many paths available Use of X intersections Road hierarchy less clearly defined Volumes harder to estimate |
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Tributary |
Closed network Fewer paths available Use of T intersections Road hierarchy more clearly defined Volumes easier to estimate |
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Permeability: Active Modes |
Better permeability for active modes rather than motorized modes.
Links for pedestrians and cyclists Distance is a large deterrent Make active modes a more attractive option in neighborhood trips |
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Ways to reduce Speed |
Curvilinear design Lower sight distance Vertical displacement (speed bumps) Networks with shorter links More intersections |
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Transport Network Topologies |
Many networks are fixed to a limited number of routes. Its important that the nature of the network satisfies the service needs of the user and the operational/economic needs of the operator |
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Types of Networks |
NODES AND LINKS (series or parallel) Ring Line Tree Mesh Spoke Fully connected |
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Reliability is... |
Route can be closed due to link or node closure Route open but travel time very variable (undermines 'just in time' method) Many alternative paths = redundancy (good in this case) |
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Probabilities |
In series R = problink1 * problink2 In parallel R = 1 - (problink1 * problink2) |
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Birnbaums Reliability Importance |
RI(a) = delta*R/delta*r |
