What must you reckon with when all passengers carry luggage in a fully occupied coach?

When all passengers carry luggage in a fully occupied coach, it's crucial to be aware of potential weight constraints that may arise.

The combination of 1 and 2 is correct because:

1. There is a danger of exceeding the permissible total mass: Each vehicle has a maximum weight limit that includes everything on board. If all passengers bring luggage, it can quickly approach or exceed this limit, leading to safety and legal issues.

2. There is a danger of exceeding the permissible total axle weights: Each axle of the vehicle has a specified weight limit. If the combined weight of passengers and their luggage is too heavy, it can put too much pressure on one axle, which could undermine the vehicle's stability and safety.

Ignoring these considerations can lead to serious consequences, such as fines, safety hazards due to mechanical failures, or accidents. Therefore, it is essential to assess the combined weight accurately. The third option is incorrect because it is never guaranteed that the total mass will not be exceeded when considering additional loads. Always ensure compliance with weight regulations to maintain safety on the road.