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TransCAD

Network Settings

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Network Setting TransCAD supports four types of network

settings: Link type codes – When you want to use link type

turn penalties or when you want the results of analytic models to be summarized by link type

Turn penalties – When you want to model the cost or delay that is associated with all turns, is based on link type, or is specifically for moving from one link to another

Centroid connectors – When your network contains centroid nodes and you want to avoid movements through those nodes.

Transfer penalties – When you want to model the cost or delay associated with transferring between different line types, such as from a rail line to a truck line.

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To Include Link Type Codes in a Network(Trans.map)

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If links have cost functions that vary by link type

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Turn Penalties

Most TransCAD procedures let you apply restrictions, penalties, or delays when turns are made between links in a network. Some situations when this is useful are: Turns that are physically or legally prohibited Signalized or congested intersections which result

in delays for traffic in one or more directions Delays that occur when there is a transition from

one type of link to another (e.g., from on-ramps to a highway or at toll plazas for tunnels and bridges)

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To Include Turn Information in a network

To specify if there are

special type of link will

include the turn penalty

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Using the Turn Penalty Toolbox TransCAD provides tools to help you

create and edit specific turn penalty tables. With these tools, you can: Create a specific turn penalty table Display specific turn penalties on a map Interactively add, edit, and delete specific

turn penalties

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To Open the turn penalty Toolbox

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Left turn with penalties

Remove Panelties

Choose Penalties

Add a Penalty

Hide and Show

Type Penalty Value

Apply to Network

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Centroids

Centroids are special nodes in a network that represent the center of a transportation analysis zone. In many transportation forecasting applications, trip either start or end at centroids. You identify centroids by creating a selection set. The links that connect centroids to the other links in a network are known as centroid connectors.

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To Use Centroids

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Transfer Penalties

In some networks, there is a cost associated with changing from traveling on one line type to another. For example: When freight is transferred from one mode

to another, a cost or delay is incurred Transferring from a ramp to a highway can

cause a delay and may involve a cost

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To Include Transfer Penalty Information in a Network

Column Penalty needed

After this, Then Create a Network

File

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To Use Transfer Penalties

Choose Penalty Column here

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