ATCP 2070 - Red violation countermeasures controllerAdaptive traffic control systems can be easilly implemented over ATCP. ATCP-RE used red extension when a red violation is detected. Background Source: Dickey S., Bougler B., Kretz P., Nelson D., Ko J., Misener J.A., “Intersection Signal Controllers and vehicle-infrastructure integration: putting safe intersections to practice”, Transportation Research Board Annual Meeting, Paper 08-2627, 2008. Intersection crashes are a tremendous safety and social problem. Consider that in 2004, 40% – or 2.5 million – of all police-reported crashes in the United States either occurred at intersections or were intersection-related. Of the intersection crashes, 8,619 were fatal and 848,000 resulted in injury. Translated into percentage of all police-reported crashes in the United States, 22.5% of all fatal crashes and 46 percent of all injury crashes occurred at intersections. A very serious and considerably-studied intersection crash is the “red light running”, or signal violation. Approximately 20% of all intersection crashes occur due to signal violation crashes, resulting in an estimated $13 billion a year in a monetization of fatalities plus lost wages, medical costs, property damage and insurance. In recent years, a host of researchers have considered ‘dynamic’ countermeasures, the basic idea being countermeasures that adapt to impending conflicts depending on knowledge and reaction to vehicle kinematic and impending signal phase and timing. For example, Newton et al. have measured the impact of a countermeasure for an all red extension on the “uncertainty zone”, i.e. the region surrounding the 50% probability of stopping. Ring structure: 
Red violation on a time-space diagram: 
Timing diagram: 
Movies (right click the link, select Save As and then play them with your Windows Media Player. Movies do NOT stream well.):
|