Is it permitted to drive downhill on neutral gear?

It is allowed to shift to neutral gear while driving a public vehicle, a bus or a taxi downhill in a non-urban road only.

It is possible to drive in neutral gear in a moderate slope, where there is no risk of brake overheating, in order to save fuel.

It is allowed to shift to neutral gear in any non-urban road which is moderately sloped, in order to save fuel.

It is absolutely forbidden. the gears must always be selected and operated .