...at most of, if not all the bus stops, giving the passengers an uncomfortable ride.

[Tan Elaine]

1. The bus driver braked hard at most of, if not all the bus stops, giving the passengers an uncomfortable ride.
2. The bus driver braked hard at most, if not all, of the bus stops, giving the passengers an uncomfortable ride.
3. The bus driver braked hard at most of, if not all, the bus stops, giving the passengers an uncomfortable ride.

Which is the correct sentence?

Thanks.

 

[GoesStation]

Number 2 is best.

 

[jutfrank]

I would use ...at most, if not all of the bus stops