an outrigger obstruction detection system for an aerial fire truck that will warn the driver of an impending obstruction to an outrigger prior to full extension of the outrigger . the system comprises ultrasonic sensors located at or near each outrigger assembly on the aerial fire truck , which can be programmed to detect an object within the travel range of the outrigger . in addition , a control / indicator panel is mounted in the cab of the aerial fire truck . the control / indicator panel is positioned in the cab to allow the driver physical and visual access . the control / indicator panel contains the power switch , diagram of the truck and indicator lights used to warn the driver of an obstruction . the sensors provide an electrical signal to a control / indicator panel located in the cab of the aerial fire truck to alert the driver if an object is detected . this alert allows the driver to reposition the truck to clear the obstruction , which in turn reduces the time to react to the emergency . the ultrasonic sensors are affixed to the aerial fire truck via a pivotal mounting assembly , which allows proper sensing alignment to be achieved .