Question

Why is it advisable to tie luggage kept in the roof

Answer 1

A luggage is usually tied with a rope on the roof of buses. When a moving bus suddenly stops, the luggage on its roof tends to continue in the state of motion due to inertia of motion. Hence the luggage fall down from the roof of the bus. Similarly, when a bus suddenly starts, the luggage on the roof of the bus tends to continue in the state of rest and hence fall down from the roof of the bus. Thus, to avoid the falling of the luggage, it is tied with a rope on the roof of a bus.
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source:studyadda

Answer 2

It is advisable to tie luggage that is kept on the bus.

When a bus starts to move the luggage will fall due to inertia of rest and when the bus stops the luggage can also fall due to inertia of motion.
It may harm the passengers sitting below.

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