Edit a Horizontal Design Standard (Parameters)

Description

Select the design parameters to reference in the standard.

Access

Alignment / Design / Horizontal Design Standards Standards / Horizontal / Insert a new design parameter standard or Edit a design parameter standard / Parameters

Requirements

Design module
Horizontal Design Parameter Sets

Controls

Parameter Type	Description
Maximum Side Friction	Select the parameter set that defines the maximum allowable coefficient of side friction between the vehicles tyres and the road pavement at different design speeds.
Maximum Superelevation	Select the parameter set that defines the maximum superelevation at different design speeds.
Transition Curve Requirement	Select the parameter set that defines the maximum radius of the computed circular curve where transitions must be applied.
Minimum Transition Curve Length	Select the parameter set that defines the minimum transition length at the design speed to build up the superelevation at an acceptable rate.
Maximum Deflection Angle	Select the parameter set that defines the maximum deflection angle at a horizontal intersection point before a curve must be added.
Minimum Curve Length	Select the parameter set that defines the minimum curve length required at different design speeds.

Notes

Use horizontal design standards when computing curves at alignment intersection points.
Sample horizontal design standards are provided in the LISTECH - Alpha template.
If you edit a horizontal design standard all alignments that use the standard are updated.
If you delete a horizontal design standard, all alignments that use the horizontal design standard will have their horizontal standard set to 'None'.
Editing or deleting a horizontal design standard which is used by an alignment on a locked layer may change the geometry of the alignment.
Use the Import Configuration tool, to import a horizontal design standard into an existing project or template.