Option

Description

Lane Width for Preliminary Horizontal design

Enter the lane width to be used when calculating transition curve lengths for preliminary horizontal alignment design, when there is no Edge level data available.

Runoff Method

Click the bitmap to change the option (TRH 17 development method).

Transition curves

Start at Normal crossfall

Click the image to change the option. If this option is selected, the transition curve will start at the Normal crossfall position.

Start at Level + Normal crossfall

Click the image to change the option. If this option is selected, the transition curve will start at the Level + Normal camber position.

Runoff Method

TRH

Click the image to change the option. If the Camber -> Crossfall -> Full option is selected, the superelevation will be developed according to the following graph.

Not TRH

Click the image to change the option. If the Camber -> Full option is selected, the superelevation will be developed according to the following graph.

Transition Length / Superelevation Runoff Length

You have the option to use either the RSA or UK formula for the calculation of the superelevation runoff lengths (L) during the Slave Super function.

Transition / Super RSA

Select this option to use the RSA formula for the calculation of Super elevation runoff lengths and Transition lengths. See a detailed explanation.

Lane Factor

Enter the lane factor to ensure antiquate adjustment when calculating run-off lengths. (l) Only used by the RSA formula.

Transition / Super UK

Select this option to use the UK formula for the calculation of Super elevation runoff lengths and Transition lengths. See a detailed explanation.

Centripetal accel. (q)

Enter the value for the centripetal acceleration (m/sec3). Only used by the UK formula.

Superelevation Rate (e)

Dropdown list

Specify the method used to calculate the superelevation rate (e).

• Use Superelevation Graphs - Use Superelevation Graphs to calculate the superelevation rate (e). This is the default option.

• Use Formula - Use a formula, rather than the Superelevation Graphs, to calculate the superelevation rate (e). When this option is selected, the Super Graph button on the Design Criteria dialog is disabled.

Constant (c)

Only used when Use Formula is selected. Specify the constant to be used in the calculation.

Maximum Super (%)

Only used when Use Formula is selected. Specify the maximum superelevation rate that will be used for the calculation.