Rehab and Crossfall Optimisation Subassemblies

Use these subassemblies to rehabilitate roads and/or optimise the crossfall of roads.

Generally speaking, these rehab and crossfall optimisation subassemblies provide an easier way to perform rehab design and analysis in your rehab corridor optimisation workflows. These subassemblies are designed to help you to determine ideal design lane crossfall outputs through improved flapping calculations and have additional parameters that other overlay subassemblies don't.

You may notice the term "flapping" being used in Overlay Slope Options for these subassemblies. Flapping in this case is a term used to describe how the Corrected Crossfall for the overlay layer in a rehab subassembly is calculated. Flapping outcomes are different, relative to the slope tolerance and the slope difference between existing ground cross slope and ideal cross slope.

• If the slope difference is less than the slope tolerance for the subassembly, then the use case is considered "within tolerance".
• If the slope difference is greater than the slope tolerance for the subassembly (slope tolerance is exceeded), then the use case is considered "outside of tolerance".

Note: For information about changes made to the behaviour of some of the overlay slope options in the rehab subassemblies, see Updates to the Corridor Rehab Subassemblies.

Note: Rehab subassemblies will show the same default values in the Civil Imperial Subassemblies and Civil Metric Subassemblies when you preview them in the Properties palette, regardless of which units of measurement used by your drawing. However, the appropriate metric or imperial values will be displayed in the Rehab Parameters palette depending on the units of measurements used in your drawing.

Image	Subassembly	Common Uses
	OverlayLevelCrown Default Tool Palettes: Civil Metric Subassemblies, Civil Imperial Subassemblies	Overlay with levelling on a crowned carriageway.
	OverlayLevel1Lane1Side Default Tool Palettes: Civil Metric Subassemblies, Civil Imperial Subassemblies	Overlay with levelling on an uncrowned carriageway.
	OverlayMillCrown Default Tool Palettes: Civil Metric Subassemblies, Civil Imperial Subassemblies	Overlay with milling on a crowned carriageway.
	OverlayMill1Lane1Side Default Tool Palettes: Civil Metric Subassemblies, Civil Imperial Subassemblies	Overlay with milling on an uncrowned carriageway.
	OverlayMillLevel1Lane1Side Default Tool Palettes: Civil Metric Subassemblies, Civil Imperial Subassemblies	Overlay with milling and levelling on an uncrowned carriageway.
	OverlayMillLevelCrown Default Tool Palettes: Civil Metric Subassemblies, Civil Imperial Subassemblies	Overlay with milling and levelling on a crowned carriageway.