The information below is intended to reflect the preferred practice of Main Roads Western Australia ("Main Roads"). Main Roads reserves the right to update this information at any time without notice. If you have any questions or comments please contact Dave Nicholls by e-mail or on (08) 9323 4325.
To the extent permitted by law, Main Roads, its employees, agents, authors and contributors are not liable for any loss resulting from any action taken or reliance made by you on the information herein displayed.
Main Roads has developed an excel spreadsheet that reads in a MX visibility report (example provided below) then calculates and displays where overtaking barrier line marking should be provided.
The start and end chainages are calculated based on the process defined in Australian Standards AS1742.2
An example of the drawing presentation based on the output can be found in drawing 200331-0033.
NOTE: Barrier line marking should be verified on site in accordance with AS1742.2
Project Instructions and Workflow
MX visibility report (input file)
Barrier Line Spreadsheet