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9 Cards in this Set

  • Front
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Grid

Open ended network


Many paths available


Use of X intersections


Road hierarchy less clearly defined


Volumes harder to estimate



Tributary

Closed network


Fewer paths available


Use of T intersections


Road hierarchy more clearly defined


Volumes easier to estimate

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



Ways to reduce Speed

Curvilinear design


Lower sight distance


Vertical displacement (speed bumps)


Networks with shorter links


More intersections

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

Types of Networks

NODES AND LINKS (series or parallel)


Ring


Line


Tree


Mesh


Spoke


Fully connected

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)

Probabilities

In series


R = problink1 * problink2


In parallel


R = 1 - (problink1 * problink2)



Birnbaums Reliability Importance



RI(a) = delta*R/delta*r