When driving a commercial public transport coach (Category D) carrying 50 passengers, why is defensive driving and headway management critically elevated?

1. Many occupants may be standing or unbelted, so an emergency stop injures far more people than it would in a car, and the vehicle's mass makes that stop far longer
2. A coach stops in a shorter distance than a car because its brakes are more powerful, so a short headway is safe
3. Coaches are given priority over other traffic, so the driver does not have to anticipate the vehicle in front
4. Passengers are secured by seatbelts on every coach, so heavy braking carries no risk to them