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detected traffic data were transmitted to
Centris which was located inside the signal
controller cabinet via network cable. In non-
lane based traffic, success ratio of 80-90%
was observed by camera based detection. The
optimization algorithm PTV Epics collects the
detector data inside Centris from camera to
produce new signal control strategy for a local
junction.
Traffic Management Center
All three junctions were monitored centrally
inside traffic management center for operation
and maintenance. PTV Balance located
centrally in traffic management center collects
the data from individual signal controller and
determines OD pattern on the corridor and
Integration with local controller optimizes the corridor every five minutes by
The local signal controller was operating with fixed time sending signal plan to PTV Epics to optimize
mode and had very limited functionality for dynamic traffic the traffic flow at junction level.
signals. An intelligent small device called Centris (developed Post Installation Results
by the Turkish company ISSD) was integrated with the local After testing and calibration of the system
signal controller, thereby enabling it for adaptive traffic on ground, the traffic survey was carried for
signal control. The Epics algorithm which is running inside post installation to evaluate the improvement
Centris will optimize the traffic flow second by second with of new signal strategy with dynamic traffic
respect to the traffic demand collected from detection
cameras. The Centris will act as a master controller whereas signal. Measurement includes traffic flow,
local controller acts as a slave unit. PTV Epics analyses traffic queue length, speed, delay etc. It is observed
conditions locally and determines the best control option for that overall network traffic flow was increased
the single node and Centris will trigger the local controller by 6% during the same peak hour as before
to switch traffic lights accordingly. with fixed signal plan. Pre-and Post traffic study
was validated with statistical student T-test and
Installation of Detection Camera it was found that at 95% confident interval,
On each direction of traffic, a camera was placed at both flows did have significant differences. The
50-60m away from the stop line to measure downstream New signal control strategy showed significant
traffic at the height of 6-8m from the ground level. The improvement in different traffic performance
indicator. The travel time, number of stops and
delay has been reduced by around 25%-45%.
Overall network speed has been increased
from 28kmph to 33.7kmph during a peak hour
with an improvement of 20%.

Prabhu TD Sonal Ahuja Florian Weichenmeier
Sr. Transport Planner, Regional Director, Realtime Traffic Software,
PTV MENAi Region PTV MENAi Region PTV Group AG

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