Traffic Model: Difference between revisions

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{{being updated}}
{{being updated}}
{{learned|file=|what a Traffic Model is|how a Traffic Model relates to the {{software}}|about the different Traffic Models in the {{software}}|how to add a Custom Traffic Model to your project|how to change the Traffic Model dynamically in your project}}


== What is a Traffic Model ==
== Traffic model in the {{software}}==
''From Wikipedia, the free encyclopedia''
The purpose of the default traffic model in the {{software}} is to calculate the effects of traffic on the [[3D World]] through traffic intensity. In order to calculate this impact, data such as the number of lanes, traffic speed and the traffic intensity on a particular road can be added to the project. The traffic model is a static model that does not change by carrying out [[Actions]], [[Upgrades]] or [[Measures]] for example. Read below how to create your own dynamic traffic model and use it in the {{software}}.  
 
The following (dynamic) overlays show data from/effects of the traffic model:  
A traffic model is a mathematical model of real-world traffic, usually, but not restricted to, road traffic. Traffic modeling draws heavily on theoretical foundations like network theory and certain theories from physics like the kinematic wave model. The interesting quantity being modeled and measured is the [[Traffic Flow (Overlay)|traffic flow]], i.e. the throughput of mobile [[units]] (e.g. vehicles) per time and transportation medium capacity (e.g. [[Constructions#Roads|road]] or lane width).
 
== How does a Traffic Model relate to the {{software}}? ==
The main purpose of the default traffic model in the {{software}} is to calculate the effects of traffic on the [[3D World]] through traffic densities. In order to calculate this impact, data such as the number of traffic lanes, the traffic speed and the traffic flow on a particular lane can be added to the project. The traffic model is a static model that does not change by carrying out [[Actions]], [[Upgrades]] or [[Measures]] for example. Read below how to create your own dynamic traffic model and use it in the {{software}}.  
The following overlays show data from/effects of the traffic model:  
* [[Traffic Density (Overlay)]]
* [[Traffic Density (Overlay)]]
* [[Traffic NO2 (Overlay)]]  
* [[Traffic NO2 (Overlay)]]  
* [[Traffic Noise (Overlay)]]
* [[Traffic Noise (Overlay)]]


==Traffic Data==
When creating a [[Wizard|new project]] a traffic model is generated for the selected project area, based on available open data sources. The following datasets are used:
* [[Project_Sources#Sources_connected_to_the_Tygron_Platform|NSL Monitoringstool]]
* [[Project_Sources#Sources_connected_to_the_Tygron_Platform|NWB (Nationaal Wegen Bestand)]]
* [[Project_Sources#Sources_connected_to_the_Tygron_Platform|INWEVA 2015]]
* [[Project_Sources#Sources_connected_to_the_Tygron_Platform|VI-Lucht & Geluid]]
<!--
====INWEVA 2015====
:INWEVA is short for INtensiteiten op WEgVAkken (traffic intensities on road sections). Traffic intensities are measured on ca. 3000 road sections. For the other sections intensities are estimated, based on traffic modeling. The data are yearly averages per road section, and updated each year.
:'' See also: https://nis.rijkswaterstaat.nl/portalcontent/logon/p2_33.html
====VI-Lucht & Geluid====
:VI-Lucht en Geluid is a Dutch tool that provides the following data for a specific section of a road:
*An average traffic intensity expressed in motor vehicles per week day, per average daytime hour, per average evening hour, per average nighttime hour
*The share and size of medium heavy and heavy freight traffic
*The share and size of bus traffic
:In januari 2016 the application was updated and actualized for the last time.
:'' See also: https://www.infomil.nl/onderwerpen/klimaat-lucht/luchtkwaliteit/slag/hulpmiddelen/inschatten/
-->


===Edit Traffic data===
===Traffic data===
[[File:Traffic_data.jpg|thumb|200px|left|The right panel shows details about the selected road part]]
[[File:Traffic_data.jpg|thumb|200px|left|The right panel shows details about the selected road part]]
====Height offset====
====Height offset====
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''This field specifies the max allowed speedlimit on road or part of a road.''
''This field specifies the max allowed speedlimit on road or part of a road.''
<br  clear= all>
<br  clear= all>
==Data sources==
When creating a [[Wizard|new project]] a traffic model is generated for the selected project area, based on available open data sources. The following datasets are used:
*[[Project_Sources#Sources_connected_to_the_Tygron_Platform|NWB (Nationaal Wegen Bestand)]]
*[[Project_Sources#Sources_connected_to_the_Tygron_Platform|NSL Monitoringstool]]
*[[Project_Sources#Sources_connected_to_the_Tygron_Platform|INWEVA 2015]]
*[[Project_Sources#Sources_connected_to_the_Tygron_Platform|VI-Lucht & Geluid]]
<!--
====INWEVA 2015====
:INWEVA is short for INtensiteiten op WEgVAkken (traffic intensities on road sections). Traffic intensities are measured on ca. 3000 road sections. For the other sections intensities are estimated, based on traffic modeling. The data are yearly averages per road section, and updated each year.
:'' See also: https://nis.rijkswaterstaat.nl/portalcontent/logon/p2_33.html
====VI-Lucht & Geluid====
:VI-Lucht en Geluid is a Dutch tool that provides the following data for a specific section of a road:
*An average traffic intensity expressed in motor vehicles per week day, per average daytime hour, per average evening hour, per average nighttime hour
*The share and size of medium heavy and heavy freight traffic
*The share and size of bus traffic
:In januari 2016 the application was updated and actualized for the last time.
:'' See also: https://www.infomil.nl/onderwerpen/klimaat-lucht/luchtkwaliteit/slag/hulpmiddelen/inschatten/
-->
==Traffic intensity===
'''[[Project_Sources#Sources_connected_to_the_Tygron_Platform|INWEVA 2015]]'''
Traffic intensity for highways
'''[[Project_Sources#Sources_connected_to_the_Tygron_Platform|VI-Lucht & Geluid]]'''
Excel based traffic model for estimating traffic intensity based on characteristics of a road:
* Traffic speed
* Is it a one way street or not?
* Is the road inside an urban area or not (NL: binnen of buiten de bebouwde kom)?
* Is there a separate cycle path along the road?
* Are there more than 2x2 lanes?
* Is parking along the road possible?
These characteristics combined with the [[Attribute#URBANIZATION|urbanization]] factor, determines the type of road. In the Excel model, the different road types have different average traffic intensities. The average daytime traffic intensity is converted to an hourly value to be used for the TRAFFIC_FLOW attribute.


==Add a custom Traffic Model==
==Add a custom Traffic Model==

Revision as of 15:49, 30 March 2020

Please note: This page is currently being updated.


Traffic model in the Tygron Platform

The purpose of the default traffic model in the Tygron Platform is to calculate the effects of traffic on the 3D World through traffic intensity. In order to calculate this impact, data such as the number of lanes, traffic speed and the traffic intensity on a particular road can be added to the project. The traffic model is a static model that does not change by carrying out Actions, Upgrades or Measures for example. Read below how to create your own dynamic traffic model and use it in the Tygron Platform. The following (dynamic) overlays show data from/effects of the traffic model:


Traffic data

The right panel shows details about the selected road part

Height offset

This field specifies the height offset of a bridge.

Units per hour

This field specifies the traffic intensity: the number of units that drive on the road in an hour.

Lanes

This field specifies the number of lanes that a road can have.

Noise Sigma

This field specifies the correction factor at reference traffic speed [1].
This value is used in the calculation of the Traffic Noise (Overlay).

Noise Tau

This field specifies the correction factor per 10 km/hour deviation from reference traffic speed [2].
This value is used in the calculation of the Traffic Noise (Overlay).

Speedlimit

This field specifies the max allowed speedlimit on road or part of a road.

Data sources

When creating a new project a traffic model is generated for the selected project area, based on available open data sources. The following datasets are used:


Traffic intensity=

INWEVA 2015 Traffic intensity for highways

VI-Lucht & Geluid Excel based traffic model for estimating traffic intensity based on characteristics of a road:

  • Traffic speed
  • Is it a one way street or not?
  • Is the road inside an urban area or not (NL: binnen of buiten de bebouwde kom)?
  • Is there a separate cycle path along the road?
  • Are there more than 2x2 lanes?
  • Is parking along the road possible?

These characteristics combined with the urbanization factor, determines the type of road. In the Excel model, the different road types have different average traffic intensities. The average daytime traffic intensity is converted to an hourly value to be used for the TRAFFIC_FLOW attribute.

Add a custom Traffic Model

It is also possible to creata and add a custom traffic model, better suited for your use case. The traffic model can be either a static model (the model and data do not change in the project) or a dynamic model (the model and data change when something in the 3D world changes).

See also

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