Designing a Road Not Starting at Chainage Zero
This is done by specifying the start chainage value as the radius of the first PI.
There are 2 methods available for entering the horizontal alignment, for this example we will be using the spreadsheet method to enter the data.
I want my road to start at chainage 105; this information is entered in the first row under the radius column.
Once the horizontal alignment has been modified to start at 105, all dialogs related to this road will automatically reflect the change.
Coordinate the new road.
Extract cross sections.
The vertical alignment will also automatically pick up the new start chainage. After entering the vertical alignment, we need to generate levels.
The next step is to generate edge levels.
This is all that is needed for a new road. If you have designed a road, and later find that the start chainage needs to be changed, then the vertical alignment and edge levels will not automatically shift the same amount as specified in the horizontal alignment. The vertical alignment and edge levels will have to be edited manually.
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