Bump Sign
The bump sign is a diamond-shaped yellow warning sign with the word "BUMP" in black letters. It warns drivers that there is a raised area or bump in the road surface ahead. Bumps can result from uneven pavement, railroad crossings that sit higher than the road surface, speed bumps or speed humps, bridge approach transitions, frost heaves, or poorly patched road repairs. Hitting a bump at high speed can cause you to lose control of your vehicle, damage your tires or suspension, cause cargo to shift, and injure passengers. When you see this sign, slow down before you reach the bump. The right speed depends on the severity of the bump — some are minor, while others can launch a vehicle if taken too fast. After the bump, you can gradually return to your normal speed. The bump sign is different from the dip sign: a bump warns of a raised area, while a dip warns of a low area. Some areas use "SPEED HUMP" or "SPEED BUMP" signs specifically for traffic-calming devices in residential areas and parking lots, which are intentional bumps designed to keep speeds low.
Rules & What to Do
Slow down before reaching the bump. Maintain a firm grip on the steering wheel. Avoid braking on the bump itself. Watch for motorcycles and bicycles that may be more affected by the uneven surface.
Penalties
No penalty for the warning sign itself. However, driving too fast over a bump and losing control can result in a reckless driving citation with fines of $150-$500.
For Commercial Drivers
Bumps are especially hazardous for commercial vehicles. The suspension system on loaded trucks amplifies the impact. Cargo can shift violently when hitting a bump at speed. Tanker vehicles experience extreme liquid surge. Flatbed loads can become unsecured. Slow down well before the bump — the weight of a commercial vehicle magnifies the force of impact. Check load security after passing through areas with multiple bumps.
Frequently Asked Questions
What does a bump sign mean?
A bump sign warns that there's a raised area in the road ahead. Slow down before you reach it to avoid losing control or damaging your vehicle.
What is the difference between a bump sign and a dip sign?
A bump sign warns of a raised area in the road. A dip sign warns of a low area or depression. Both require you to slow down, but dips may also collect standing water.
What is the difference between a speed bump and a speed hump?
A speed bump is shorter and more abrupt, typically found in parking lots, requiring near-stop speeds (5 mph). A speed hump is longer and more gradual, found on residential streets, designed for 15-20 mph.