Which type of cargo is prohibited from being carried on a bus with riders?

The transportation of tear gas on a bus with passengers is prohibited due to safety and security concerns. Tear gas is classified as a weapon or chemical agent that can cause harm or panic among passengers. Given the confined space of a bus, using or being exposed to tear gas could lead to serious health risks, both for individuals directly exposed and for all passengers in the vehicle. Regulations surrounding the transport of hazardous materials prioritize the safety of individuals and the public, thus prohibiting such items from being carried in passenger vehicles.

In contrast, food items and medical supplies are generally allowed on buses, as they do not pose health or safety risks. Repair tools, while they can be a nuisance if not properly secured, do not have the same level of danger as tear gas. Therefore, the guidelines clearly prohibit hazardous materials like tear gas to ensure the well-being of all passengers on board.