Slow Moving Vehicle Sign
The slow moving vehicle (SMV) sign is a fluorescent orange triangle with a red reflective border, displayed on the back of vehicles that travel at speeds significantly below the normal traffic flow — typically 25 mph or less. You'll see this sign on farm equipment like tractors and combines, horse-drawn buggies, road maintenance vehicles, and other slow-moving machinery. The sign is not a road sign mounted on a post — it's attached directly to the slow-moving vehicle itself. When you see this sign on a vehicle ahead, it's warning you that the vehicle is traveling much slower than you are. Reduce your speed and be prepared for a significant speed difference. Do not follow too closely, and only pass when it's safe and legal to do so. Approach with caution because slow-moving vehicles often make wide turns into fields or driveways without warning. Rear-end collisions with slow-moving vehicles are common, especially on rural highways where you may come upon them quickly. The combination of high approach speed and the slow vehicle creates closing distances that surprise many drivers.
Rules & What to Do
Slow down when you see the orange triangle on a vehicle ahead. Do not follow too closely. Only pass when it's legal and safe, with adequate visibility. Watch for the vehicle to make wide or unexpected turns. Be especially alert on rural roads.
Penalties
There's no penalty for encountering a slow-moving vehicle sign. However, illegally passing a slow vehicle or following too closely can result in fines of $100-$300. Rear-ending a slow-moving vehicle usually results in the following driver being found at fault.
For Commercial Drivers
CDL drivers on rural routes frequently encounter slow-moving farm equipment. The closing speed between a truck at 55 mph and a tractor at 15 mph is dramatic — you'll cover the distance between you very quickly. Start braking early and leave extra room. If your commercial vehicle itself qualifies as slow-moving (such as during oversized load transport), display the SMV emblem on your rear.
Frequently Asked Questions
What does the orange triangle sign on the back of a vehicle mean?
The orange triangle with a red border is a slow moving vehicle emblem. It means that vehicle travels at 25 mph or less. Slow down and prepare for a large speed difference.
What vehicles need a slow-moving vehicle sign?
Vehicles that travel at 25 mph or less on public roads must display the SMV emblem. This includes farm tractors, horse-drawn buggies, road construction equipment, and other slow machinery.
What shape is the slow-moving vehicle sign?
The slow-moving vehicle emblem is an upward-pointing triangle with a fluorescent orange center and red reflective border. It's designed to be visible both day and night.