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Parking guidance and information (PGI)
systems, or car park guidance systems
, present drivers with dynamic information on parking
Parking is the act of stopping a vehicle and leaving it unoccupied for more than a brief time. Parking on one or both sides of a road is commonly permitted, though often with restrictions...
within controlled areas. The systems combine traffic monitoring, communication, processing and variable message sign
A variable- message sign, often abbreviated VMS, CMS, or DMS, and in the UK known as a matrix sign,...
technologies to provide the service. PGI systems are a product of the worldwide initiative for the development of intelligent transportation system
The term intelligent transportation systems refers to information and communication technology that improve transport outcomes such as transport safety, transport productivity, travel reliability, informed travel choices, social equity, environmental performance and network operation...
in urban areas. PGI systems can assist in the development of safe, efficient and environmentally friendly transportation network .
PGI systems are designed to aid the in the search for vacant parking spaces by directing drivers to car parks where occupancy levels are low. The objective is to reduce search time, which in turn reduces congestion
Traffic congestion is a condition on road networks that occurs as use increases, and is characterized by slower speeds, longer trip times, and increased vehicular queueing. The most common example is the physical use of roads by vehicles. When traffic demand is great enough that the interaction...
on the surrounding roads for other traffic
Traffic on roads may consist of pedestrians, ridden or herded animals, vehicles, streetcars and other conveyances, either singly or together, while using the public way for purposes of travel...
with related benefits to air pollution
Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere....
with the ultimate aim of enhancement of the urban area.