Use an assembly offset to associate a point on a subassembly with a secondary horizontal baseline (which can be an alignment or a feature line). This is especially useful in a corridor region such as a knuckle or lane widening.
Figure 4: Assembly with offset
Figure 4 shows an assembly with an offset on the curb subassembly on one side of the roadway. This offset can be associated with a horizontal baseline that defines the outside road edge as it widens to accommodate a turn lane or off-ramp.