As farmers across Ohio prepare for the transition from harvest to winter and ultimately spring planting, the familiar, triangular slow-moving vehicle (SMV) emblem remains an essential tool for ensuring farm safety. CFAES experts highlight that the SMV emblem, now a global icon, was created on Ohio State's campus.
"“This sign is more than an icon for safety. It’s often recognized as a symbol for farm and rural equipment, and embodies the phrase, ‘farmers at work,’” said Dee Jepsen, a CFAES professor and the state leader for OSU Extension’s Agricultural Safety and Health Program. “Created 60 years ago, it’s right up there with the McDonald’s arches as an icon that is recognized worldwide.”
The development of the SMV emblem began in the CFAES Department of Food, Agricultural and Biological Engineering. Funded by the Automotive Safety Foundation, the research team examined over 700 collision cases involving farm equipment on roadways. The study revealed that 65% of crashes were rear-end collisions, underscoring the need for a distinct emblem that could make slow-moving vehicles more visible. The SMV emblem’s triangular shape features a fluorescent orange center visible by day, and retroreflective red edges visible by night — designed to ensure visibility in various lighting conditions.
“Many farmers are aware of the laws surrounding lights and SMV signage,” Jepsen said. “SMVs are an early warning signal for approaching motorists, along with lights and reflective materials. All of these items are crucial for visibility.” Shortly after its development in 1962, the SMV emblem traveled 3,689 miles across the country from Portland, Maine, to San Diego, California, mounted on the back of a farm wagon. This journey quickly garnered national recognition from farmers, equipment dealers, and legislators. In 1963, Ohio State dedicated the emblem to the public, ensuring it would not be patented or trademarked but freely used for safety.
“Ohio State made a significant contribution to public safety by giving this symbol to everyone,” said Jepsen. Ohio later adopted legislation requiring SMV emblems on all slow-moving vehicles, including horse-drawn carriages. The emblem has been updated with improved reflective materials, and it remains a critical safety feature for vehicles traveling under 25 mph. For more information on farm safety, visit agsafety.osu.edu.