TriMet has specific policies regarding the transport of large items on their vehicles to ensure the safety and comfort of all passengers. Generally, large items are permissible as long as they can be accommodated safely without obstructing aisles or doorways. Examples of acceptable large items include strollers, small bicycles, and luggage, as long as they do not exceed certain size limits. However, there are restrictions on items that may hinder other passengers or create a safety hazard. It is important to ensure that any large item can be secured and will not interfere with the operation of the vehicle or the comfort of other riders. Passengers are encouraged to be mindful of their surroundings and considerate of fellow travelers. For detailed information about specific size limits and other relevant policies, it may be beneficial to visit the current TriMet website for comprehensive guidelines regarding bringing large items on their services.