Set design criteria.
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RD_DESIGNCRITERIA |
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This function allows you to specify design criteria for the Horizontal alignment, Vertical alignment and Superelevation design. You can either use the default TRH 17 values, or create and use your own design criteria file.
Check the Use Design Criteria option to use the design criteria in the design process and specify the Design Speed for the road.
Designing roads that do not meet the design criteria specification does not stop you from using them as such. The design criteria serve only as a warning to the user.
Procedure
The Design Criteria displays.
See the Superelevation Design topic for a detailed explanation of the superelevation design process.
Cross Section
|
Nr. of Lanes |
Lane Factor |
Median Width |
Undivided |
2 |
1.0 |
- |
Undivided |
3 |
1.2 |
- |
Undivided |
4 |
1.5 |
- |
Undivided |
2 |
1.5 |
Less than 4.6 m |
Undivided |
3 |
2.0 |
Less than 4.6 m |
Divided |
2 |
1.0 or 1.5 |
4.6 to 12.2 m |
Divided |
3 |
1.2 or 2.0 |
4.6 to 12.2 m |
Divided |
2 |
1.0 |
Greater than 12.2 m |
Divided |
3 |
1.2 |
Greater than 12.2 m |
Enter the radii at each design speed next to the appropriate super elevation rate,e in percentage. When changing any of the values, the graph is updated instantaneously.