When creating a cul-de-sac there are occasions when a "Chainage outside alignment range" error occurs.|
This usually happens when using the Asymmetric option as the alignment does not start and finish at the same coincidental point.
To remedy this try the following procedure;
- Click on Cul-de-sac button.
- Click on the cul-de-sac alignment.
- Make sure you are on the tab used to create the cul-de-sac and make a note whether the cul-de-sac is at the start or end of the alignment.
- Click on Vertical Grading Controls button.
- You will see 3 boxes "extend CL to" and 2 "transfer levels to".
- Click on the top box and pick the start of your cul-de-sac alignment.
- Click on the middle box and choose your desired location for the "extend CL to". The road alignment centreline levels will carry through to the location chosen then the cul-de-sac alignment will interpolate the remaining levels based on radians from the end of the "extend CL to".
- For the bottom box click on the end of the cul-de-sac alignment.
- Make sure the template in the pull down box is set to auto (if visible) if both sides of your road have similar codes otherwise your will need to use a custom template.
- Click on display vertical grading.
- Follow the rest of the process as normal.
- If this does not work and the cul-de-sac is at the end of the alignment add 1mm to 5mm to the value of each of the above mentioned boxes in step 5 and then follow on from step 8. If the cul-de-sac is at the beginning of the alignment then subtract 1mm to 5mm.
- Note that the points picked on the cul-de-sac alignment will report the chainages from the road alignment CL.
- The points picked on the cul-de-sac alignment will transfer levels from the road alignment to the cul-de-sac alignment. This means that if you want full control of the cul-de-sac alignment the above method is correct. If you want the road crossfall to dictate the cul-de-sac levels then pick points further into the alignment.