Final answer:
Long backboards are often stored in the compartment under the bench inside the ambulance or in the rear most compartment on the passenger's side, depending on ambulance design.
Step-by-step explanation:
Long backboards, which are used in emergency medical services for spinal immobilization and patient transportation, can typically be found in various locations within an ambulance, as the layout may differ depending on the ambulance design. However, commonly they are stored either in the compartment under the bench inside the ambulance, which allows for ease of access by the emergency personnel, or in the rear most compartment on the passenger's side, another common location due to its accessibility and the need for quick retrieval in an emergency.
The specific storage location for long backboards may vary, so it's crucial for emergency medical technicians (EMTs) and paramedics to be familiar with the design of their particular ambulance.