I have read before about car-to-car or vehicle-to-vehicle communication, and apparently the US Department of Transportation is way ahead. V2V “allow cars to share information about their position, speed and heading with each other and alert a driver when there is potential for danger. That could be a car speeding through an intersection ahead or a truck in your blind spot when trying to change lanes.”
These systems have been mentioned in here because this study tries to find the optimal time and place to show potential alerts. V2V may bring great benefits to road traffic, but before the technology perfects itself, we should have well established the ideal time to activate alert systems.