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Vehicle Path

Vehicle Path (VPath) for Windows, AutoCAD and 12d Model, calculates the swept path of vehicles which follow a predefined steering path. Vehicle swept paths are used in road design to check that there is sufficient room for turning vehicles to operate safely on the road network and to avoid causing damage to roadside furniture. Swept path templates are also used by vehicle designers to check that vehicles will meet the swept path performance standards set by vehicle licencing authorities.

When interoperating with AutoCAD, the VPath control panel allows the user to select a vehicle from a list of standard or custom vehicles for driving along a steering path that has been set out on an AutoCAD drawing and have the swept path generated in the drawing. Similarly, it is possible to generate a turning template at a given position on the drawing. The user does not have to work with data files as with standalone operation. The VPath control panel operations that relate to AutoCAD only become active if AutoCAD is running. Note that it is still possible with standalone operation to have VPath produce swept paths in AutoCAD DXF, Script or AutoLisp formats and "manually" import these into an AutoCAD drawing.

When installed, it is possible to run Vehicle Path from within 12d Model. Vehicle Path is accessed via the Design menu, where a vehicle is selected from the standard or custom vehicles file and a steering path (alignment string) is picked. Swept path strings are created and stored in user defined models. For assistance with the interoperation of 12d Model and Vehicle Path refer to 12d Model online help.

With standalone operation, data for VPath is in the form of commands which are set up in a data file. The data is created or edited via a set of forms that guide the entry and editing of data without the user having to be aware of any commands or data formats. The data in the file constitutes a single VPath session which may be saved for later reuse. Optionally, output can be plotted to a variety of output formats using menu item VPath > Options > Preview Plot.

Support Details

VPath is provided free of charge. The provision of full technical support is limited to users who are employees of the Department of Transport and Main Roads Queensland or consultants performing work for the department.

For further details, refer to to the 'Help > About' dialog in VPath.

To be notified of updates to VPath click on the following link and provide your contact details in the e-mail body:
Register Contact Details

For more information, contact CADD Systems via the Service Centre:

Phone: +61 7 3066 2000

If your request is of an urgent nature, could you please follow your email up with a phone call to +61 7 3066 2000, as the Service Centre mailbox is primarily for non urgent requests.


The VPath V3.0.3 installation is available below. The VPath help file is provided as an optional standalone download if required.


  1. Download the installation folder to a folder on your hard drive. 
  2. If you have a previous version of VPath for Windows, go to 'Control Panel, Add/Remove Programs' and remove it.
  3. Unzip the download file ( and run the installation file VPathV303.msi, follow the instructions (install as administrator or with administrator privileges).
  4. A program group will be created for All Users - Start\Programs\VPath
  5. For a more detailed description of the program, refer to the VPath help file that is accessible after installation.

System requirements:

  • Windows XP Professional SP3 
  • Windows 7

Interoperates with:

  • AutoCAD 2008-11 (including Map) (AutoCAD® © Autodesk, Inc.)
  • 12d Model V9 or later (12d® Model™ © 12D Solutions Pty Ltd).
Last updated
12 February 2018