Final answer:
The reflective orange triangle, or Slow-Moving Vehicle emblem, is displayed on vehicles that travel 25 mph or less to alert faster-moving traffic of their presence for safety.
Step-by-step explanation:
The reflective orange triangle on the rear of certain vehicles is known as a Slow-Moving Vehicle (SMV) emblem. It is required by law in many areas to be displayed on vehicles that travel 25 mph or less, including farm vehicles, tractors, construction vehicles, and horse-drawn carriages. This emblem is designed to alert faster-moving traffic to the presence of a slow-moving vehicle on the road to prevent accidents and ensure road safety.