Roundabout Properties: Swept Path Analysis: Design Vehicles

The roundabout must be capable of accommodating appropriate vehicles. This tab allows you to manage the usage of design vehicles and/or to add new design vehicles.

Expand Swept Path Analysis and click Design Vehicles in the left hand pane. The Design Vehicles page is displayed.

The Design Vehicles frame lists vehicles that are defined in the standard along with any others that have been created.

Select the vehicles you wish to include in the swept path analysis and clear those that you wish to omit.

Note: Design vehicles that are specified in the standard are regarded as mandatory and so omitting them from the analysis list will generate a design check warning.

To add a vehicle to be analyzed, click New. The Design Vehicle dialog is displayed.

Vehicles that have been created in the Roundabout Properties dialog may be edited but those defined in the standard may only be viewed. In either case, highlight the vehicle and click Edit or View. The Design Vehicle dialog is displayed.

The Design Criteria frame lets you specify the offsets from curb and lane markings.

The Design Vehicle Curb Offset is the minimum distance between the inscribed circle curb and the outer body envelope of the design vehicle turning in steady state around the roundabout.

Note: This value is used by Roundabouts, in conjunction with the design vehicle critical dimensions, solely to calculate the minimum circulatory width required. It is not used to limit the placement of actual paths on the roundabout.

The Design Vehicle Lane Offset is the minimum distance between the circulatory lane markings and the outer body envelope of the design vehicle turning in steady state around the roundabout.

In all cases the Max and Min values represent the limiting values from the adopted design standard.