You cannot create dynamic 3D corridors with assemblies. No superelevation lanes. No intersection rebuilding. For highway design, you need Civil 3D or an older copy of InRoads.
To understand the hype, we must go back to 2003-2004. Autodesk had not yet fully merged civil tools into the "Civil 3D" dynamic model. Instead, Land Desktop sat on top of classic AutoCAD 2004, acting as a sophisticated vertical application. autodesk autocad 2004 land desktop civil design hot
In the early 2000s, Autodesk sold perpetual licenses. You bought AutoCAD 2004 Land Desktop once, and it was yours forever. After Autodesk moved to a rental-only model (2016 onwards), many small civil firms and independent surveyors refused to pay $2,500+ annually. They dusted off their old LDD 2004 CDs. The search term "hot" often refers to cracked or license-transfer "hot" deals on eBay and engineering forums. You cannot create dynamic 3D corridors with assemblies