Basic Lane Transition

C3D BasicLaneTransition — lane with 5 width/elevation transition modes

At a glance


Kind	Subassembly (composed into an assembly)
Domain	Road
Civil 3D equivalent	`BasicLaneTransition`
Geometry	9 points, 4 links, 1 shapes
Conditional geometry	6 of the points are created inside a branch — which ones appear depends on the parameters and the target surface
Targets	2 (surface / offset / elevation targets this subassembly can be linked to)

Parameters

Defaults are the metric values the palette inserts. Every parameter can be driven by an expression or a target.

Parameter	Type	Default	Meaning
`Side`	+1 right of the baseline, −1 left	Right (+1)	+1 Right / -1 Left
`LaneWidth`	number (metres unless the description says otherwise)	3.6	Lane width (m)
`LaneDepth`	number (metres unless the description says otherwise)	0.2	Pavement depth (m)
`LaneSlope`	cross slope as a ratio (−0.02 = 2 % fall)	-0.02	Lane cross slope
`TransitionType`	whole number / mode selector	2	0 hold both, 1 hold elev/change offset, 2 hold grade/change offset, 3 hold offset/change elev, 4 change both

Points

Point codes are what feature lines, styles and quantity take-off match on — they are the contract this subassembly publishes.

Point	Code	Placed	From	Expression
`P1`	Crown	placed at the attachment point (an absolute offset/elevation)	—	`0 / 0`
`ETW` conditional	ETW	horizontal delta from the reference, elevation from a slope	P1	`Side*LaneWidth / LaneSlope`
`ETW` conditional	ETW	offset + elevation delta from the reference point	P1	`SideLaneWidth / LaneWidthLaneSlope`
`ETW` conditional	ETW	horizontal delta from the reference, elevation from a slope	P1	`Side*LaneWidth / LaneSlope`
`ETW` conditional	ETW	horizontal delta from the reference, elevation from a slope	P1	`Side*LaneWidth / LaneSlope`
`ETW` conditional	ETW	offset + elevation delta from the reference point	P1	`SideLaneWidth / LaneWidthLaneSlope`
`ETW` conditional	ETW	horizontal delta from the reference, elevation from a slope	P1	`Side*LaneWidth / LaneSlope`
`P3`	Crown_SubBase	offset + elevation delta from the reference point	P1	`0 / -LaneDepth`
`P4`	ETW_SubBase	offset + elevation delta from the reference point	ETW	`0 / -LaneDepth`

Links

Link	Code	Between	Role
`L1`	Top,Pave	P1 → ETW	drawn
`L2`	—	ETW → P4	drawn
`L3`	Datum,SubBase	P4 → P3	drawn
`L4`	—	P3 → P1	drawn

Shapes (materials)

Shape	Material code	Boundary points
`S1`	Pave1	P1, ETW, P4, P3

Generated page. The tables above are read from the built-in catalogue itself (yu3d_stock_dump), so they always match the version of yucad3d you are running.