Attributes of links
The Links window opens when you insert a network object and have selected to have the Edit dialog opened automatically after object creation (Right-click behavior and action after creating an object). By default, only the Links list is opened.
Into the window, you enter attribute values for the network object. For network objects which have already been defined, you can call the window using the following functions:
- ► In the list of network objects of the network object type, double-click the row with the desired network object.
- ► In the Network editor, select the network object of your choice. Then, on its shortcut menu, click Edit.
The network object may have additional attributes. In the network objects list of the network object type, you can show all attributes and attribute values. You can open the list via the following functions:
- ► On the network object sidebar, right-click the desired network object type. Then on the shortcut menu, click Show List (Shortcut menu in the network object sidebar).
- ► In the Network editor, select the network object of your choice. Then, on its shortcut menu, click Show In List (Selecting network objects in the Network editor and showing them in a list).
- ► On the Lists menu, in the desired category, click the network object type.
In the network objects list of the network object type, you can edit attributes and attribute values of a network object (Selecting cells in lists), (Using lists).
The objects of this object type may have relations to other objects. This is why the attributes list is shown as part of a coupled list (on the left). On the Lists toolbar, in the Relations box, you can show and edit the coupled list with the attributes of the desired relation on the right (see below Showing and editing dependent objects as relation) and (Using coupled lists).
Note: In lists, you can use the Attribute selection icon to show and hide attribute values (Selecting attributes and subattributes for columns of a list). |
Basic attributes of links
The basic attributes of the network element are shown in the upper area of the window and in the list of network objects for the particular network object type.
Element | Description |
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No. |
Unique number of the link |
Name |
Designation of the link |
Count Lanes |
Number of lanes (NumLanes). The table in the Lanes tab is automatically adjusted. If there already is a lane and you increase the number of lanes, the new lane is inserted in the Network editor and adopts attributes from the existing lane. |
Link Length |
Length2D: Length of the link in meters Length3D accounts for z-offset of the link |
BehaviorType |
Link behavior type (LinkBehavType): Standard driving behavior of the vehicles for this link, if no individual link behaviour type is allocated to the lanes of this link. Vehicles using a lane, that a link behavior type has been allocated to, take the link behavior type of this lane into account (Defining link behavior types for links and connectors), (Defining driving behavior in a driving behavior parameter set). If the attribute Is pedestrian area is selected, the link behavior type None is automatically selected. |
Display type |
Colored display of the link (Defining display types). In the coupled list Lanes, in the Display Type column, you can edit the Display Type attribute for individual lanes of the link. The coupled list Lanes is selected in the Links list, in the Relations list box. |
Level |
For modeling of multistory buildings or bridge structures: level on which the link is located |
Has passing lane |
HasOvtLn: The inner lane may only be used for overtaking maneuvers on the oncoming lane. This is only possible on links with at least two lanes (Modeling overtaking maneuvers on the lane of oncoming traffic). If this option is selected, for right hand traffic, the outer left lane is displayed as the passing lane, with hatched background. For left hand traffic, the lane on the far right is the passing lane, displayed with hatched background. If a passing lane and regular lane of a link of the opposite direction overlap for long enough, the overlapping area may be used for passing. Only select this attribute for links on which passing is actually allowed in reality. Avoid passing lanes on which overtaking is not possible in reality, e.g. at intersections or in traffic controlled areas. You can also select this attribute for several, successive links that are connected via connectors and have at least two lanes. Vehicles can then use the entire overlapping area for overtaking maneuvers. If the passing lane is closed for a vehicle class, the vehicles of this class cannot use the passing lane for overtaking. You can place other network objects, e.g. data collection points, on passing lanes. Passing lanes are not shown in 3D mode. |
Lanes tab
The list in the tab contains, amongst others, the following attributes:
Column | Description |
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Index |
Unique number of the lane. You cannot change this entry later on. |
Width |
Width of the lane, minimum value 0.001 m. If several lanes are defined, several rows are displayed. You can define different widths. The width has an effect on:
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BlockedVehClasses |
Blocked vehicle classes on this lane.
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Display type |
Color of lane (Defining display types) |
NoLnChLAllVehTypes NoLnChRAllVehTypes |
No lane change left – all vehicle types and No lane change right– all vehicle types: If this option is selected, vehicles may not change lanes. A prohibition of lane changes is shown in the 2D and 3D mode by means of a solid line. |
NoLnChLVehClasses NoLnChRVehClasses |
No lane change left - vehicle classes and No lane change right - vehicle classes: Vehicle classes, whose vehicles must not change from a chosen lane to the adjacent lane in the direction of travel. A prohibition of lane changes is shown in the 2D and 3D mode by means of a solid line. |
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Notes:
The option All Vehicle Types is a virtual vehicle class that automatically includes all new vehicle types and vehicle types that have not been assigned a vehicle class yet. |
Meso tab
Link attributes for mesoscopic simulation:
Long name | Short name | Description |
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Meso speed model |
MesoSpeedModel |
Specifies how the speed of vehicles on this link is determined.
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Meso speed |
MesoSpeed |
Meso speed is used exclusively in combination with the meso speed model Link related (Car following model for mesoscopic simulation). In this case, the meso speed defines the speed for all vehicles on the link. Default value 50.0 km/h |
Meso follow-up time |
MesoFollowUpGap |
Follow-up gap between two vehicles in the same traffic flow. Edit this attribute in the Meso turns list or in the Nodes - Meso turns coupled list (Attributes of meso turns), (Attributes of nodes). |
Pedestrian Area tab
Attributes of links, if they are meant to be used by pedestrians and not by vehicles:
LongName | Short name | Description |
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Is pedestrian area |
IsPedArea |
Only with Viswalk: If this option is selected, the link is defined as a pedestrian area (Modeling links as pedestrian areas). For the opposite direction, an additional link is automatically defined as pedestrian area. Both links have the same position in the Network Editor and are displayed in the Links list in each row. The Reverse pedestrian link attribute (RvsPedLink) of both links shows the number of the corresponding link in the opposite direction. |
Pedestrian Behavior section |
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Area behavior type |
AreaBehavType |
Is used to model occasional changes to the speed or other parameter (Modeling area-based walking behavior). |
Desired speed factor |
DesSpeedFact |
Factor for changing the desired speed of all pedestrians, default value100 %, value range 10 % to 300 %. Using the desired speed factor, you can reduce the desired speed on the route when pedestrians move slower than at their originally desired speed, for example when walking on bad ground or carefully crossing a road. Using the desired speed factor, you can increase the desired speed on the route when pedestrians move faster than at their originally desired speed, for example when quickly crossing a road. |
Conflicts with vehicles section |
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Consider vehicles in dynamic potential |
ConsVehInDynPot |
If this option is selected, dynamic potentials of pedestrians consider current vehicle positions in conflict areas. This attribute also has an effect on the oncoming lane. For the pedestrian route locations of the pedestrian route leading across the link and for which you have selected the dynamic potential, select a calculation interval that is sufficiently short (Dynamic potential attributes). |
G for vehicles |
VehDynPotG |
Vehicles dynamic potential G: Dynamic potential parameters affecting the general strength of vehicles, default value: 3. This attribute also has an effect on the oncoming lane. |
Display tab
Attributes for the display of the link. The attributes do not influence the driving behavior.
The tab contains, amongst others, the following attributes:
Element | Description |
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3D |
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z-offset (start) |
ZOffset (zOffsetStart): Starting point of z-coordinates of link for 3D display. |
z-offset (end) |
z-offset (end) (zOffsetEnd): End point of z-coordinates of link for 3D display. |
By default, z-offset (start) and z-offset (end) do not have any impact on the driving behavior when it comes to upward or downward gradients. If the z-coordinates in your Vissim network have been entered correctly, you can have Vissim calculate upward and downward gradients. In this case, the option Use gradient from z coordinates must be selected (Selecting network settings for vehicle behavior). If you change the values of the z-offset (start) or the z-offset (end) and have inserted intermediate points into the link, Vissim will recalculate the z-offset values of the intermediate points. To ensure that the upward or downward gradient is harmonious, Vissim calculates a spline for the vertical course of the link. |
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Thickness (3D) |
Thickness for display of the link in 3D mode. |
Element | Description | ||
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Visualization |
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Individual vehicles |
Show individual vehicles (ShowVeh): Select this option to show vehicles in the 2D mode. If this option is not checked, no vehicles are indicated in the 2D mode. With this, you can indicate underpasses or tunnel sections. This option applies for the entire link. Therefore you must define a separate link for each underpass or for each tunnel.
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Show classified values |
ShowClsfValues: Select this option to show classified values (not to show the display type selected). To show classified values, in the graphic parameters for links, select a color scheme and an attribute (Assigning a color to links based on aggregated parameters). |
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Label |
If this option is not checked, the labeling of the link is not shown. |
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Show link bar |
If the option is selected, link bars can be displayed on the link (List of graphic parameters for network objects). |
Other tab
The tab contains, amongst others, the following attributes:
Element | Description |
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Gradient |
Uphill and downhill slopes of the link in percent. Downhill slopes have a negative value. The value impacts the driving behavior via the maximum acceleration and maximum deceleration on a link.
Per default, uphill and downhill slopes in 3D mode do not affect the display (z-coordinates) of links. You can edit z-coordinates via the z-Offset attribute. If the z-coordinates in your Vissim network have been entered correctly, you can have Vissim calculate uphill and downhill slopes. In this case, the option Use gradient from z coordinates must be selected (Selecting network settings for vehicle behavior). |
Overtake only PT |
OvtOnlyPT: Vehicles traveling on a route with at least two lanes may overtake a stationary public transport vehicle during boarding and alighting of passengers if there is enough space ahead of it. In all other cases, overtaking is not possible. |
Element | Description |
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Evaluation |
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Vehicle record |
Vehicle record active (VehRecAct): Select this option to record link data for the vehicle record. |
Lane changes evaluation active |
LnChgEvalAct: Select this option to record lane data for the Lane Change evaluation. |
Link evaluation active |
LinkEvalAct: Select this option to record link data for the link evaluation. If you selected the attribute Use as Pedestrian Record, you can still record link data for the pedestrian record. |
Segment length |
The segment length which is taken into account in the link evaluations |
Network performance |
NetPerfEvalAct: If this option is selected, the link is taken into account for network performance evaluation. To select individual link sequences using network performance evaluation, deselect this attribute for all other links. In the network performance evaluation of a micro simulation or a mesoscopic simulation, parking spaces and vehicle inputs are only counted for the output attributes Demand (latent) and Delay (latent), if for their links, Network performance evaluation active is selected. The output attribute Vehicles (arrived) only records vehicles that have driven on a link for which the attribute Network performance evaluation active is selected. In the network performance evaluation of a mesoscopic simulation, the data is used for all meso edges that lead across at least one link for which the attribute Network performance evaluation active is selected. |
Emission calculation |
EmiCalcAct: If the option is selected, emissions are calculated on this link for vehicles with an emission class or emission DLL (Configuring emission calculation for a vehicle type). |
Dyn. Assignment tab
The attributes on the Dyn. Assignment tab are only relevant for dynamic assignments (Using dynamic assignment):
Element | Description | |
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Cost |
Distance-dependent costs per km (CostPerKm). |
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Surcharge 1 Surcharge 2 |
One-time surcharges that are taken into account for path evaluation (Influencing path search and path choice). In the dynamic assignment, the costs for the vehicles which travel on this link are determined. Maximum value: 1,000,0006 |
In the Overtaking in the opposing lane:
Element | Description | |
---|---|---|
Overtaking speed factor: |
OvtSpeedFact: Factor by which the vehicle wants to overtake, increasing its desired speed. Default 1.30. |
The following attributes are only relevant for modeling overtaking maneuvers on the oncoming lane:
Element | Description | |
---|---|---|
Look ahead distance |
Look ahead distance for overtaking (LookAheadDistOvt): Distance that the overtaking vehicle can view on this link, upstream of the oncoming lane. At this distance oncoming traffic is perceived by drivers. At the end of this distance a virtual, oncoming vehicle is assumed, if on this link there is a vehicle input, a PT line or an inbound connector further upstream. The shorter the look ahead distance for overtaking is, the smaller the likelihood of being able to overtake. Default 250 m. |
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Assumed speed of oncoming traffic |
AssumSpeedOncom: Speed of vehicles in oncoming lane in the following situations:
The higher the assumed speed of oncoming traffic is, the smaller the possibility of overtaking in these situations. Default value 60 km/h. If there is an oncoming vehicle within the look ahead distance of the vehicle wishing to overtake, Vissim uses its current speed. |
The following attribute is only relevant for matrix correction:
CountedData (CntData): Shows the count data of the selected vehicle class, if configured in the matrix correction procedure (Correcting demand matrices). |
The network object may have additional attributes, for example, the following. These can also be shown in the Attributes list:
Element | Description |
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WktPolyline |
WKT polyline: Polygonal line of the link center with start point and end point in Cartesian Vissim-world coordinates in WKT-LINESTRING format |
WktPolylineWGS84 |
WKT polyline (WGS84): Polygonal line of the link center with start point and end point in WGS84 coordinates (latitude / longitude) in WKT-LINESTRING format |
WktLoc |
WKT location: Absolute position of the marking position of the link in Vissim-world coordinates in WKT-POINT format |
WktLocWGS84 |
WKT location (WGS84): Absolute position of the marking position in WGS84 coordinates in WKT-POINT format |
LatWGS84 |
Latitude (WGS84): Geographical latitude as a decimal number according to WGS84 |
LongWGS84 |
Longitude (WGS84): Geographical longitude as a decimal number according to WGS84 |
Showing and editing dependent objects as relation
The attribute and attribute values of this network object type are shown in the list on the left, which consists of two coupled lists.
1. In the list on the left, click the desired entry.
The list on the right contains attributes and attribute values of network objects, and/or base data allocated to the network object selected in the list on the left (Using coupled lists):
- Turns (evaluation): Attributes of turns of the selected link. The node-edge graph must be created for node evaluation (Generating a node-edge graph).
- Turns (dynamic assignment): Attributes of turns of the selected link. The node-edge graph must be created for dynamic assignment (Generating a node-edge graph).
- Dynamic vehicle routing decisions (Defining dynamic routing decisions)
- Lanes: The attributes are described further above.
- Vehicles: only during running simulation: attributes of vehicles on this link
- Vehicle travel time measurements (Defining vehicle travel time measurement)
- Vehicle route closures (Attributes of route closures)
- Vehicle routes (partial) (Attributes of partial vehicle routes)
- Vehicle partial routing decisions (Attributes of partial vehicle routing decisions)
- Vehicle inputs (Modeling vehicle inputs for private transportation)
- Pedestrians: only during running simulation: attributes of pedestrians on this link
- Blocked vehicle classes for dynamic assignment (Defining the vehicle class)
- Edges (evaluation): Attributes of edges of the selected link. (Attributes of edges). The node-edge graph must be created for node evaluation (Generating a node-edge graph).
- Edges (dynamic assignment): Edges of turns of the selected link. (Attributes of edges). The node-edge graph must be created for dynamic assignment (Generating a node-edge graph).
- Conflict areas (Using conflict areas)
- Managed lane routes (Attributes of managed lane routes)
- Managed lanes routing decisions (Attributes of managed lanes routing decisions)
- Public transport lines (Modeling PT lines)
- Partial PT Route (Attributes of partial PT routes)
- PT partial routing decisions (Attributes of PT partial routing decisions)
- Parking lots (Modeling parking lots)
- Parking routes (Attributes of parking routes)
- Parking routing decisions (Attributes of parking routing decisions)
- Points 3D:
x, y |
Coordinates of start point, destination point and inserted intermediate points of the link or connector |
ZOffset |
Vertical offset > 0.000 along the z-axis relative to the height of the level, for connectors to the level of the From-link. |
Point |
Coordinates x, y and z of the point |
Radius |
Depending on the Radius effect of the following radius:
Default values: empty for start point and end point, one value calculated for each intermediate point Depending on the value of the attribute Radius effect: If the Radius is > 0, the vehicle can drift sideways. If the Radius is > 0 and < 1 km, the speed of the vehicle is automatically reduced in curves. |
Radius source |
Source of the value of the attribute Radius:
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Radius effect |
Effect of the Radius attribute value:
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- Static vehicle routes (Attributes of static vehicle routes)
- Static vehicle routing decisions (Attributes of static vehicle routing decisions)
- Queue counters (Modeling queue counters)
- Link evaluation segments: not for links for which attribute Is pedestrian area has been selected. Segments of link for link evaluation (Showing data from links in lists). Start point, end point and length of each segment on the link in [m].
2. On the list toolbar, in the Relations list, click the desired entry.
3. Enter the desired data.
The data is allocated.
Superordinate topic:
Modeling links for vehicles and pedestrians
Information on editing: