Dip Sign
The dip sign is a diamond-shaped yellow warning sign with the word "DIP" in black letters. It warns that there is a low spot or depression in the road ahead. A dip can be caused by a drainage channel, a low-water crossing, a change in grade, or uneven road settling. Hitting a dip at high speed can cause you to lose control of your vehicle, damage your suspension, or even become airborne momentarily. The sudden change in road elevation can also cause items in your vehicle to shift. When you see this sign, slow down to a speed that allows you to drive through the dip smoothly and safely. Dips are especially dangerous because they can collect water during rain, creating conditions for hydroplaning or even flash flooding. In the desert Southwest, dip signs often mark low-water crossings that can fill suddenly during storms. Never attempt to drive through a flooded dip — it's impossible to judge the water's depth, and just six inches of moving water can knock you off your feet, while two feet can float a vehicle.
Rules & What to Do
Slow down before reaching the dip. Do not drive through standing water of unknown depth. Be aware that a dip may hide oncoming traffic or road hazards. Maintain a firm grip on the steering wheel as you pass through the uneven surface.
Penalties
No penalty for the warning sign itself. Driving too fast through a dip that results in a crash can result in a citation for driving at an unsafe speed, typically $100-$250 and 2-3 points on your record.
For Commercial Drivers
Dips pose special hazards for commercial vehicles. The sudden change in grade can cause trailer bounce and cargo shifting. Low-clearance vehicles may bottom out or get hung up on severe dips. Tanker trucks must be especially cautious — liquid surge during a dip can dramatically affect vehicle control. Slow down well in advance and maintain a steady speed through the dip.
Frequently Asked Questions
What does a dip sign mean?
A dip sign warns that there's a low spot or depression in the road ahead. Slow down to safely navigate the change in road elevation and watch for water that may collect in the dip.
What is the difference between a dip sign and a bump sign?
A dip sign warns of a low spot or depression in the road, while a bump sign warns of a raised area. Both require you to slow down, but a dip may also collect standing water.
Should you drive through a flooded dip?
No. Never drive through a flooded dip or low-water crossing. You can't judge the depth, the road underneath may be washed out, and as little as two feet of water can float a vehicle. Turn around — don't drown.