What is a common characteristic of a slow-moving vehicle?

A common characteristic of a slow-moving vehicle is that it is identified by a unique triangular sign. This sign, typically colored orange and red, is specifically designed to alert other drivers that the vehicle is traveling at lower speeds than normal traffic. The purpose of this sign is to enhance safety on the road by providing clear visual cues to both motorists and pedestrians, allowing them to exercise caution when approaching a vehicle that may be slower than typical road speeds.

The other options, while they contribute to understanding vehicle classifications, don't fit the defining feature of slow-moving vehicles. For instance, these vehicles usually do not travel at speeds above 35 mph, they typically cannot operate on highways where higher speeds are the norm, and being electric is not a requirement for being classified as a slow-moving vehicle. Instead, the focus is on their maximum speed and proper identification to ensure safety on the roads.