This dialog box allows you to define how the automatic maximum side friction factor is calculated. It is accessible from the button adjacent to the Max Side Friction (f) field in the horizontal curve panel (auto must be selected).
The Max Side Friction (f) field is hidden (and there is no way to view this dialog box) unless you have chosen Use side friction factor in the Auto Super-elevation Options.
Select table (button)
This button (at the right of the dialog box) opens the Lookup Table dialog box allowing you to view, open or save the maximum side friction table.
This lookup table contains maximum side friction values as a function of curve design speed. An example table is shown below.
First column is unused
First row is design speed (km/hr)
Body (second row) is maximum Side Friction Factor (unitless)
40
50
60
70
80
90
100
110
0
0.17
0.16
0.15
0.145
0.14
0.13
0.12
0.11
In the example above a curve with a design speed of 50km/hr must have a side friction factor less than 0.16. Note that design speeds less than 40km/hr are not defined.
button adjacent to the