In recent years, the use of video systems for traffic monitoring
has shown promise over that of traditional loop detectors.
The analysis of traffic video can provide global information,
such as overall traffic speed, lane occupancy, and individual
lane speed, along with the capability to track individual cars.
Because video systems are less disruptive and less costly to
install than loop detectors, interest has grown in building and
using large camera networks to monitor different aspects of
traffic, such as traffic congestion.