PASSAGE uses two
different types of cameras to monitor traffic and detect vehicles.
Pan-Tilt-Zoom (PTZ) cameras are placed at key
intersections and are used to monitor traffic
situations, congestion, and incidents throughout the
county. PTZ cameras can horizontally scan 360 degrees,
tilt up and down, and zoom, allowing operators to see
nearly a mile. About every five minutes, an image of
each leg of an intersection is sent to the PASSAGE
website through the fiber optic network. Selecting the
camera icons on the PASSAGE map shows the images
captured by the PTZ cameras. In an emergency, operators
in the Transportation Management Center (TMC) can share
video images with emergency responders and also change
signal timings to help alleviate congestion. These
cameras also help Lake County enhance emergency
response and preparedness plans for Lake County and the
surrounding areas.
Detection cameras are deployed throughout Lake County,
sensing approaching traffic and cycling the signal. In
the past, loops of wire buried in the pavement were
used to detect vehicles. In recent years, overhead
cameras have been introduced, improving detection
efficiency in certain areas. Unlike fixed loops, the
camera’s area of detection can be optimized, improving
signal accommodation for different vehicle sizes and
types, from trucks to
motorcycles.
Snapshots
The camera icons on the map
show locations where snapshot pictures were taken by the PTZ cameras. The cameras take a
photo on an average of every 5 minutes
capturing an image of each approach and putting it on
the website. The intention of this feature is to
help motorists plan their trip in conjunction with
the congestion segments by viewing road conditions
prior to their trip.
