In This Work, Wireless Black Box Using MEMS Accelerometer And GPS Tracking System Is Developed For Accidental Monitoring. The System Consists Of Cooperative Components Of An Accelerometer, Microcontroller Unit, GPS Device And GSM Module. In The Event Of Accident, This Wireless Device Will Send Mobile Phone Short Massage Indicating The Position Of Vehicle By GPS System To Family Member, Emergency Medical Service (EMS) And Nearest Hospital. The Threshold Algorithm And Speed Of Motorcycle Are Used To Determine Fall Or Accident In Real-time. The System Is Compact And Easy To Install Under Rider Seat. The System Has Been Tested In Real World Applications Using Bicycles. The Test Results Show That It Can Detect Linear Fall, Non-linear Fall And Normal Ride With High Accuracy