Cars that detect alcohol intoxication and fatigue

Japanese car maker Nissan launched their concept car with alcohol detection system in mid of 2007.  It uses breathalyzer-like detection systems may provide even greater traction for Japanese efforts to keep impaired drivers off the road.  Nissan's alcohol-detection sensors check odor, sweat and driver awareness, issuing a voice alert from the navigation system and locking up the ignition if necessary.  Odor sensors on the driver and passenger seats read alcohol levels, while a detector in the gear-shift knob measures the perspiration of the driver's palm when starting the car.  But Nissan's car includes a mounted camera that monitors alertness by eye scan, ringing bells and issuing a voice message in Japanese or English if a driver should pull over and rest. 

For more details, visit their official page.