Traffic Model: Difference between revisions

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#REDIRECT [[Traffic model]]
#REDIRECT [[Traffic model]]
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 is added to the project and can be updated. 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: [[Traffic Density Overlay]], [[Traffic NO2 Overlay]], [[Traffic Noise Overlay]].
<br>
<br>
When generating a [[New Project Wizard|new project]], traffic related data is added 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]]
===Traffic data===
Traffic related data in the {{software}}, can be found on the Details tab of a [[Construction|Building]] and the [[Attribute|Attributes]] tab.
[[File:Traffic_data.jpg|thumb|200px|right|The right panel shows details about the selected road part]]
'''Height offset''' <br>
This field specifies the height offset of a bridge.
'''Units per hour''' <br>
This field specifies the traffic intensity: the number of units that drive on the road in an hour. For the data source, see [[Traffic_Model#Traffic_intensity|traffic intensity]].
'''Lanes'''<br>
This field specifies the number of lanes that a road can have.
'''Noise Sigma''' <br>
This field specifies the correction factor at reference traffic speed [http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII].<br> This value is used in the calculation of the [Traffic Noise Overlay]].
'''Noise Tau''' <br>
This field specifies the correction factor per 10 km/hour deviation from reference traffic speed [http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII].<br> This value is used in the calculation of the [[Traffic Noise Overlay]].
'''Speedlimit''' <br>
This field specifies the max allowed speedlimit on road or part of a road.
<br  clear= all>
[[File:NSL_attributes.JPG|thumb|200px|right|The Attributes tab with data from the NSL.]]
The attributes tab of a road shows more information, based on the available open data sources for this particular road and the matching of the data when generating the 3D model. Therefore, some roads have attributes from the [[Project_Sources#Sources_connected_to_the_Tygron_Platform|NSL]], visible in the image on the right.
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These attributes are not yet used in any of the calculation models, but can be used to create own [[Overlay]]s or [[Calculation_Models|calculation models]]. <br>
Each road has an NWB_ID attribute from the [[Project_Sources#Sources_connected_to_the_Tygron_Platform|NWB]].
<!--
====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===
The traffic intensity is depicted in the Platform by the ''Units per hour'' attribute (in the software named TRAFFIC_FLOW). <br>
When generating a new project, the traffic intensity is assigned based on available data sources. When the ''Units per hour'' attribute text color is black, the intensity is a default value based on the function type. When the ''Units per hour'' attribute text color is red, the data is from one of the following datasets. <br>
When the road is a highway, the data is usually from [[Project_Sources#Sources_connected_to_the_Tygron_Platform|INWEVA 2015]].
Otherwise, the intensity is based on the VI-Lucht & Geluid model (see for more information: https://www.infomil.nl/onderwerpen/lucht-water/luchtkwaliteit/slag/hulpmiddelen/inschatten/).
This Excel based traffic model estimates traffic intensity based on the following road characteristics:
* Traffic speed
* Is the road a one way street?
* 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 VI-Lucht & Geluid 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).
* [[How to add a static traffic model]]
* [[How to add a dynamic traffic model]]
[[File:QA_NWBID_wiki.jpg | link=https://www.tygron.com/nl/2020/04/17/hoe-kan-ik-mijn-eigen-verkeersmodel-koppelen-mbv-nwb-id/]]
(In Dutch)
==See also==
*[[Project sources]]
* [[Traffic Density Overlay]]
* [[Traffic NO2 Overlay]]
* [[Traffic Noise Overlay]]

Latest revision as of 16:32, 27 January 2023

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