Usually Time headway is calculated as the time difference between two vehicles (front-front bumper of rear-rear bumpers) on the same position (same lane). in non lane based traffic it is the same but the position is a line on a road stretch (the same direction). what are the motivations behind using the whole road stretch ? In my case I have a road of 3 lanes (same direction) and I group two lanes to see the pattern of time headway. Meaning I calculate Time Headway based on a line along the two lanes. Does this make sense in traffic theory ? It does seem unconventional but since I have vehicle arrival with no respect to lane separators, it seems to me that the arrival of a vehicle in a position on the two grouped lanes is influenced by the preceeding vehicles no matter what it's position in the two grouped lanes.
P.S : Each lane in my scenario is of 3 to 3.25 meters width
In this case (last ten years), the headway in group of lanes during off peak had been provided within 5 seconds. If a driver drove his car passing the virtual loop, it leased to extend the range of green times. Howeve, it was not over the maximum green times. In case of red times, there was no vehicle to pass the virtual loop.
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