Ramp meterA ramp meter, ramp signal, or metering light is a device, usually a basic traffic light or a two-section signal light (red and green only, no yellow) together with a signal controller, that regulates the flow of traffic entering freeways according to current traffic conditions. Ramp meters are used at freeway on-ramps to manage the rate of automobiles entering the freeway. Ramp metering systems have proved to be successful in decreasing traffic congestion and improving driver safety.
Traffic congestionTraffic congestion is a condition in transport that is characterized by slower speeds, longer trip times, and increased vehicular queueing. Traffic congestion on urban road networks has increased substantially since the 1950s. When traffic demand is great enough that the interaction between vehicles slows the traffic stream, this results in congestion. While congestion is a possibility for any mode of transportation, this article will focus on automobile congestion on public roads.
QiIn traditional Chinese culture and the East Asian cultural sphere, qi, also ch'i in Wade–Giles romanization (ˈtʃiː ) or chi, is believed to be a vital force forming part of any living entity. Literally meaning "vapor", "air", or "breath", the word qi is a polysemous word often translated as "vital energy", "vital force", "material energy", or simply as "energy". Qi is the central underlying principle in traditional Chinese medicine and in Chinese martial arts. The practice of cultivating and balancing qi is called qigong.
