What Does “Greasy Side Up” Mean?

Greasy side up — Vehicle flipped or rolled over with the undercarriage facing up. The most common way to report a rollover on CB.

Shiny side down — Same meaning as greasy side up. The “shiny side” is the painted exterior, now facing the ground. Used interchangeably.

Fender bender — Minor accident, usually involving body damage but no major injuries or road blockage. “Fender bender on the shoulder, just a four-wheeler.”

Gawker block / gaper delay — Traffic slowdown on the opposite side of the highway caused by drivers slowing to look at an accident. “Gawker block eastbound from the greasy side up westbound.”

Pile up — Multi-vehicle accident, often in poor visibility (fog, snow, blowing dust). One of the most dangerous highway situations.

Rubber side down — The positive version: tires on the road, everything normal. “Keep the rubber side down” is a common CB sign-off meaning “drive safe.”

Excessive speed on curves and ramps — The number one cause of truck rollovers. Highway exit ramps, on-ramps, and curved road sections have posted speed limits. A truck's center of gravity is much higher than a car, making it far more susceptible to tipping in a turn. Taking a 35 mph ramp at 45 mph can be enough to roll a loaded trailer.

Improperly loaded or shifted cargo — If freight is loaded unevenly or shifts during transit, the center of gravity moves to one side, making the truck unstable in turns. Top-heavy loads are especially dangerous. Always verify load distribution and use proper securement.

Liquid surge in tankers — Partially loaded tanker trailers are prone to liquid surge, where the liquid sloshes to one side during turns, dramatically shifting the center of gravity. Baffled tanks reduce but do not eliminate this risk.

Strong crosswinds — High-profile trailers like dry vans and reefers act as large sails in crosswinds. Empty trailers are especially vulnerable because they lack the weight to resist the wind force.

Overcorrection — When a driver drifts onto the shoulder and jerks the wheel to get back on the road, the sudden correction can tip the trailer. The proper response is to gradually steer back onto the road at reduced speed.

Reduce speed immediately — A rollover scene may have debris, fuel, or cargo spread across lanes. Emergency vehicles may be responding. Slow down well before you reach the scene.

Note the mile marker and direction — Listen carefully for the exact location. “At the 42” means mile marker 42. Know whether it is your direction or the opposite side (which could still cause a gawker block slowdown).

Check for alternate routes — If the rollover has shut down lanes or the road entirely, check your GPS or atlas for alternate routes. A rollover can shut down a highway for hours during recovery.

Relay the warning — If you pass the scene, relay updated information to drivers behind you. Include which lanes are blocked, estimated backup length, and whether emergency responders are on scene.

If you witness it happen — Call 911 immediately. Provide your exact location (mile marker, direction, highway). If safe, pull over and render aid. Do not approach a scene with spilled hazmat cargo.

Scene safety first — Secure the scene with triangles or flares if safe. Turn on hazard lights. Move to a safe location away from traffic if possible. Do not stand between vehicles or in active traffic lanes.

Call 911 and your company — Report the accident to emergency services and notify your dispatcher or carrier immediately. Provide location, number of vehicles, injuries, and any hazmat involvement.

Post-accident drug testing — CDL drivers may be required to submit to post-accident drug and alcohol testing within specific timeframes under FMCSA regulations. Refusing a required test has the same consequences as a positive result.

Document everything — Use your phone to photograph the scene, damage, road conditions, weather, and any contributing factors. This evidence is critical for insurance claims and CSA score disputes.