More fatal accidents occur at intersections than any other location.  Using DSRC technology, cars and traffic signals can communicate with one another, alerting un-alert drivers, of a looming red light. 

Length:  0:29
Relevant US DOT ITS research: 

• Vehicle to Infrastructure Communications for Safety
• Also see DSRC FAQs

Video source and permission for use:  DaimlerChrysler Research & Technology North America, Inc.