Optimisation of the traffic lights of the intersections of the Pärnu bypass

TRAFFEST, between 2011 and 2013 has built 9 intersections with traffic lights, at the order of the Road Administration, on the Pärnu bypass. All intersections are equipped with traffic sensors, allowing to apply coordinated, as well as adaptive traffic light programmes.
TRAFFEST, in 2018, as the result of the procurement of the Road Administration performed a study on how to make the traffic lights of the bypass even more effective, so that passing the nine traffic lights would provide greater and actual time advantages than previously.
New traffic light programmes were made for the Pärnu bypass, as a result of the study. The intersections are coordinated with each other, during daytime periods of higher traffic density, such that when driving on the Pärnu bypass at the speed limit, the driver is in a so-called “”green wave””. The intersections use in the evening period, with lower traffic density, the so-called “”all red”” programme, where the green light is given to the vehicle which reaches the intersection first, (detected by the sensor) or a pedestrian that presses the crosswalk button.
Some of the traffic sensors were also replaced with more innovative thermal sensors. An experiment was created on one intersection, where sensors detecting trucks were installed, which prolong the green light for trucks.
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