12.3 Incoming roads

Incoming roads contain lanes that lead into a junction. Because outgoing roads are not specifically defined in ASAM OpenDRIVE, incoming roads may also serve as outgoing roads, see Figure 83.

To specify a road as incoming road, its ID is referenced in the <connection> element using the @incomingRoad attribute.

Elements in UML model

<connection incomingRoad="…"> element

In ASAM OpenDRIVE, incoming roads are represented by the @incomingRoad attribute of <connection> elements within the <junction> element.

UML class: t_junction_connection_common
XML tag:   <connection> (Multiplicity: 0..*)

Provides information about a single connection within a common junction.

Table 57. Attributes of the <connection> element
Name	Type	Use	Description
`connectingRoad`	string	required	ID of the connecting road. Only to be used for junctions of @type="default".
`contactPoint`	e_contactPoint	optional	Contact point on the @connectingRoad or @linkedRoad. Required for all junction types except virtual.
`id`	string	required	Unique ID within the junction
`incomingRoad`	string	optional	ID of the incoming road. Required for all junction types except virtual.

XML example

<junction name="myJunction" id="555" >
    <connection id="0"
                incomingRoad="1"
                connectingRoad="2"
                contactPoint="start">
        <laneLink from="-2" to="-1"/>
    </connection>
</junction>

Rules

The following rules apply to incoming roads:

Connecting roads shall not be incoming roads.

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