The development of the technology is largely in response to people over 64 figuring in more than half of Japan's traffic deaths.
Some technology is also targeted at night driving, when half of Japan's road deaths occur, despite there being less traffic.
One system uses radars and cameras to trigger alerts and braking if the car is likely to hit a pedestrian or vehicle.
The system also emits infrared beams to enhance night vision.
Another technology enables the headlights to partially shield the high beam to prevent oncoming drivers being blinded.
A new one on me is a device that can detect heart-attack risk by monitoring cardiovascular functions through the driver's grasp of the wheel.