![]() Each lane number change will require the definition of a new lane segment. Lane may be divided into multiple segments, and each lane segment contains a fixed number of the lane. In OpenDRIVE, lane sections are represented by the element in the element. In order to make it easier to use lane segments on complex roads, only the attribute can be used to define one side of the road. If the lane number is changed, a new lane segment needs to be defined. In Figure 56, the road segment is divided into different lane segments. The definition of lane segments will be carried out in ascending order along the road reference line. As shown in Figure 56, each lane number change will result in a demand for a new lane segment. Each lane segment contains a fixed number of the lane. The lane can be divided into multiple segments. In order to be able to better confirm the direction, the lanes should be arranged in descending order from left to right.Each lane segment can contain a element.A element must be defined for each s coordinate.Each lane segment must contain at least one or element.The lane with a positive ID is on the left side of the center lane, and the lane with a negative ID is on the right side of the center lane. ![]() The following rules apply to lane grouping: The ID attribute is defined by the element nested in the, elements. In OpenDRIVE, lane groups are represented by the, and elements within the element. Since the lane numbers are in descending order toward the negative t direction and ascending toward the positive t direction, the application can learn the direction of the lane from the lane number given in the ID attribute (unless is bidirectional). The lanes are described in this group by the element. In order to be able to easily search in the OpenDRIVE road description, the lanes in a lane segment can be divided into left, center and right lanes. The two-way lanes can be specified in detail by using the attribute of the element.Each lane segment must have a unique lane number.Lane numbering must be continuous and without any interruptions.The lane number must start from 1 after the center lane, descending in the direction of negative t, and ascending in the direction of positive t.The center lane cannot have a width, which means that the element cannot be used for the center lane.The road can have any number of lanes as needed.Each road must have a center lane and a lane with a width greater than zero.The following rules apply to the use of lanes: In OpenDRIVE, the lane is represented by the element in the element. Since lane offset is not used, the center lane is equivalent to the road reference line. In this example, the center lane separates the direction of travel defined in the road type according to the traffic patterns of driving on the left and driving on the right. The numbering of other lanes takes the center lane as the starting point: the lane numbers are in descending order to the right, that is, toward the negative t direction to the left, they are in ascending order, that is, toward the positive t direction.įigure 51 shows the center lane of a road with multiple traffic lanes and different driving directions. The center lane has no width and is used as a reference for lane numbering, and its own lane number is 0. Need to use the center lane to define and describe the lanes in OpenDRIVE. Each road must have at least one lane with a width greater than 0, and the number of lanes on each road is unlimited.
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