skip navigation Official NH Website



Shoulder Design in MX-Uncurbed

Shoulder Design Journal Files

Shoulder Design in MX
Curbed Sections

 

Prerequisites

Before shoulders can be designed, the roadway strings must exist and have superelevation applied.
 

Creating the Shoulder

Before starting the wizard, it may be advisable to open a journal file to capture the MX commands used to create the shoulder design. This file (with some editing) can be run to reproduce the design if necessary without having to use the wizard again.

Select Shoulder Design from the Design menu.

Create a display with centerline and pavement edges. Start shoulder design wizard: Design -> Road Design -> Shoulder design...

shoulder design

 Enter alignment and pavement edge information as shown below.

shoulder design

Select "Fixed Cross Slope" method and check box for "Define Method for Outside of Curve" and "Define Method for Inside of Curve". Since the shoulder slope typically follows the roadway slope in a curbed area you may be tempted to choose the "Follow Roadway Cross Slope" method. However, doing this will not allow the option to select the shoulder roll-over option later.

shoulder design

Define shoulder width and cross slope.

shoulder design

Choose "Shoulder Roll-over" option. None of the options available reproduce NHDOT practices exactly. This is the closest one.

shoulder design

For the high side of the curve, enter the value of 0.001 as the "Maximum Shoulder Break". In a normal crown section, the shoulder follows the roadway slope. By setting this value at 0.001 (0.1%) MX will begin modifying the shoulder superelevation as soon as the traveled way starts rotating up.

shoulder design

Enter the distance between the TW and shoulder crown, maximum cross-slope of the inner half (usually 0.04), and cross-slope of the outer half (usually 0.03). Make sure the up/down arrow is pointed in the correct direction.

shoulder design

For the inside of the curve, select the "Follow Roadway Cross Slope" option.

shoulder design

Select the start and end stations. Here you can specify start and end stations of a segment of the project if the design is different in different areas.  You will have an opportunity to define the other sections later.

shoulder design

Select "Next" to work on the other side of the road or to define another segment on the same side. Modify the Edge of Pavement string label. All the previously selected options will default to the previously chosen values.

shoulder design

 

 

CAD/D Homepage | MicroStation v8 Documentation
MX Documentation  | NHDOT File Library