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To improve
traffic flow on roads controlled by traffic signals it is desirable to
detect waiting traffic rather than using passive timed signals. In a mixed flow
that includes bikes, bicycles waiting at a light should be able to inform
the controller of their presence without requiring action on the part of the
cyclist.
The diagonal quadrupole loop of wire buried under the pavement
at an intersection provides a method of achieving this objective. The light
system can detect the change of inductance induced by a vehicle waiting
in the loop area and change the light when appropriate. The layout shown has
good sensitivity and also covers the regions of the intersection regions in
which waiting bikes would be located.
Optical detection using digital
cameras and pattern recognition software are now price competitive with the buried
loop system and may be an attractive alternative method for light control,
particularly when retrofitting an intersection to accommodate a bike path. |
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