Apparatus for Ensuring Seat Belt Usage and Checking Blood Alcohol Concentration

An interface designed to ensure use of vehicle seat belt and a method with an ignition interlock for preventing operation of equipment when an operator´s blood alcohol content is above a threshold level. A microprocessor takes necessary action in case of violation of any of these conditions. If the driver´s blood-alcohol content is above the threshold level, the microprocessor sends a signal, which interlocks ignition, and if it is within the limits set in the microprocessor then it allows ignition. Next, after ignition, to check whether the driver is wearing the seat belt properly or not there are three transmitters. First transmitter sends a signal whether the seat is occupied or not. A second transmitter sends a signal whether the seat belt is latched or not and the third one checks whether the seat belt is extended enough to encircle the driver. When all the conditions are met the microprocessor sends the signal to disengage the disabling unit, which prevents gear engagement.