Updates to the Overlay Slope Options in the Corridor Rehab Subassemblies in Autodesk Civil 3D 2019.3.

The behaviour of some of the overlay slope options in the corridor rehab subassemblies has been updated in Autodesk Civil 3D 2019.3.

• The behaviour of the User Defined With Flapping parameter has changed in situations within slope tolerance and outside of slope tolerance.
• The behaviour of the User Defined Without Flapping and Outside/Inside Lane Superelevation parameters has changed in situations outside of slope tolerance.

Note: After installing the Autodesk Civil 3D 2019.3 Update, rebuild existing rehab corridors to apply the changes.

The following table describes the updated behaviour and also describes which behaviours have not changed.

Overlay Slope Option Parameter	Behaviour within slope tolerance	Example of behaviour within slope tolerance	Behaviour when slope tolerance is exceeded	Example of behaviour when slope tolerance is exceeded
User Defined with Flapping	New behaviour: The corrected cross slope will be the EG cross slope.	Given the following values: EG cross slope = -3.4% Ideal cross slope = -3.0% Slope tolerance = 0.5% The corrected cross slope will be -3.4%.	New behaviour: The corrected cross slope will vary and will be the EG cross slope plus or minus the slope tolerance value. Note: Whether the slope tolerance is added or subtracted depends on which one will bring the values of the EG cross slope and the ideal cross slope closer together.	Given the following values: EG cross slope = -3.4% Ideal cross slope = -5.0% Slope tolerance = 0.5% The corrected cross slope will be -3.9%.
User Defined Without Flapping	Behaviour is unchanged: The corrected cross slope will be the specified ideal slope.	Given the following values: EG cross slope = -3.4% Ideal cross slope = -3.0% Slope tolerance = 0.5% The corrected cross slope will be -3%.	New behaviour: The corrected cross slope will be the specified ideal slope plus or minus the slope tolerance value. Note: Whether the slope tolerance is added or subtracted depends on which one will bring the values of the EG cross slope and the ideal cross slope closer together.	Given the following values: EG cross slope = -3.4% Ideal cross slope = -5.0% Slope tolerance = 0.5% The corrected cross slope will be -4.5%.
Inside/Outside Lane Superelevation	Behaviour is unchanged: If superelevation is not specified for the alignment: The corrected cross slope will be the specified ideal slope. Note: This behaviour is the same as for the User Defined Without Flapping option. If superelevation is defined for the alignment: The superelevation value will function as the ideal slope and the corrected cross slope will be the lane superelevation value obtained from the superelevation table.	Given the following values: EG cross slope = -3.4% Ideal cross slope = -3.0% Slope tolerance = 0.5% The corrected cross slope will be one of the following: If superelevation is not specified for the alignment, then the corrected cross slope will be -3.0%. If superelevation is defined for the alignment, then the corrected cross slope will be the lane superelevation value obtained from the superelevation table.	New behaviour: If superelevation is not specified for the alignment: The corrected cross slope will be the specified ideal slope plus or minus the slope tolerance value. Note: This behaviour is the same as for the User Defined Without Flapping option. If superelevation is defined for the alignment: The corrected cross slope will be the lane superelevation value obtained from the superelevation table plus or minus the slope tolerance value.	Given the following values: EG cross slope = -3.4% Ideal cross slope = -5% Slope tolerance = 0.5% The corrected cross slope will be one of the following: If a superelevation table is not specified for the alignment, then the corrected cross slope will be -4.5%. If superelevation is defined for the alignment, the lane superelevation value obtained from the superelevation table plus or minus the slope tolerance value.