Ultratech Cement Limited v. The State of Gujarat
Background
Gujarat demanded road tax on heavy mining/construction machinery (Dumpers, Excavators, etc.) used exclusively within a cement factory and never driven on public roads.
Decision Breakdown
The Supreme Court held such machinery falls within a specific exclusion for vehicles adapted for use only in enclosed premises, and that states can only tax vehicles "suitable for use on roads": the tax demand was quashed, though the Court noted equipment actually found on public roads would lose this protection.
Lesson Learnt
Heavy machinery manufactured and used exclusively within a private, enclosed premises cannot be taxed as a "motor vehicle," even if it technically meets the general definition.