Final answer:
An orange triangle on the back of a vehicle signifies it is a slow-moving vehicle, often traveling at speeds less than 25 mph, and it is commonly found on agricultural and construction equipment.
Step-by-step explanation:
When a vehicle has an orange triangle on the back, it indicates that the vehicle is a slow-moving vehicle (SMV). This symbol is used as a warning to other motorists that the vehicle they are approaching travels at speeds lower than 25 miles per hour (mph). It is commonly seen on the back of agricultural equipment, such as tractors and combines, as well as on other types of equipment that may be used on public roads but do not typically travel at high speeds, such as road construction machinery or horse-drawn vehicles.
It's important for drivers to recognize this symbol and understand that they need to slow down and pass these vehicles with caution. The orange, reflective triangle is designed to be highly visible from a distance during both day and night, ensuring that approaching drivers have ample time to react safely.