The photos speak for themselves —

A crane on its side

Photo showing the control panel (Angle Indicator/Limitor)- The indicator was turned OFF, and the min/max warning knobs were set at their lowest and highest settings, which would not have given the operator any warning had the unit been activated anyway.

The photo showing the Rotation Gear/Bearing show that the positive house lock was NOT engaged at the time of the incident, nor was the swing brake. The operator was using the swing brake pedal.

The operator was moving the crane off the site, towards the 4 lane street in reverse, with the boom fully elevated, and the swing-away extended.(The manufacturer DOES NOT recommend any travel with the swing-away in place.)

The frontage road in front of the site had a downhill grade to it with gutters on both sides. With the boom being elevated so high, the angle of the frontage road, etc., gravity obviously had the upper hand. Fortunately there was a flatbed trailer sitting between the frontage road, and the street. When the crane went over it landed on the bulkhead of the trailer, thus keeping the boom from hitting the ground, and blocking the street.

The R/F outrigger that the operator had partially extended for some reason or another, didn't help much.