A series of values which are needed to generate and process superelevations are configured in this window. The dialog box and its parameters are shown below.
Pumping Slope (%): The pumping slope expressed as a percentage for straight sections which is proposed by default is entered here. It is normally 2 %.
Lo Increment: The camber transition length to 0% and from 0% to slope are set here, which is applied before and after the origin of L0.
Minimum Pumping Length: When activated, this box will apply the criterion of setting at least one straight section length with camber. This is indicated by the values entered in the adjacent box. This parameter analyses the length that results between transition curves and, if the difference between the start of the cambered section and its end is below the established value, the camber is cancelled. In the case of curves having same sign, superelevation continuity is set at 2% (in the case of curves of the same sign), otherwise the devil effect is produced at the center of the straight section (in the case of curves having the opposite sign).
Minimum Length of Maximum Superelevation: As with the previous element, when this command is activated it will require that a section of maximum superelevation should remain (the maximum established by the radius and superelevation table) once the L0 lengths have been applied towards the inside of the curve from its entry and exit tangents. The minimum length this section is equal to or greater than the length set in the relevant box. Should a lower value be produced, the program will modify the L0 value until it is able to apply the criterion set out above.
TcpMDT
