First, you have to set specific virtual gates and lines to your video. What you need to set are waiting for gates and lines represented by entry gates and lines (green) on the edges of the roundabout or intersection and blocking gates and lines represented by neutral gates and lines (blue) within the intersection or roundabout. A combination of entry and neutral gates might look like the following.
Now you are ready to set your own Node that will define the relationship between waiting and blocking gates/lines. Click Add Measurement Node in the main menu and set the waiting gate/line and blocking gate/line in the right-bottom menu. In this case, we have set:
- Waiting Gate = Entry Gate 1
- Waiting Lane = Entry Lane 1
- Blocking Gate = Neutral Gate 1
- Blocking Lane = Neutral Lane 1
You can set as many nodes as you want and export data for all nodes. Once you are done with your settings, Confirm Annotation Redefinition, and apply changes in Annotation Configurations. Now everything is ready to make an export to a .CSV file. Go to Analysis - Export Gap-Time/Time-to-Follow Data. You can use our Default values or you can set your own values in the following table.
The export you get will include columns with the following data:
- Unique Event ID - Unique ID of an event.
- Measurement Node ID - Unique ID of the node that you have set.
- Waiting Gate ID - Unique ID of the waiting gate that you have set.
- Video Position of First Blocking [ms] - Video-time, when a vehicle was detected as a blocking one (passed a blocking gate).
- First Blocking Vehicle ID - Unique ID of the first blocking vehicle that has passed the blocking gate.
- Second Blocking Vehicle ID - Unique ID of the second blocking vehicle that has passed the blocking gate.
- The number of Waiting Vehicles - Number of vehicles in the waiting lane, waiting to enter the roundabout/intersection.
- First Waiting Vehicle ID - Unique ID of the first vehicle in the waiting lane.
- Tg Value [ms] - Gap time - distance between the first and second blocking car in ms.
- The number of Left Waiting Vehicles - How many cars there are left in the waiting lane after the first blocking vehicle passed.
- First Left Waiting Vehicle ID - ID of the first vehicle that left the waiting lane and could continue to the roundabout.
- Entered Vehicles Count - Number of vehicles that have left the waiting lane during gap time.
- (If Entered Vehicles Count > 1: list(Tf Value [ms])) - In case of gap, time is sufficient for more vehicles to leave the waiting gate, time to follow for these vehicles is shown.
- Reaction Time [ms] - Reaction time of the following vehicle in the waiting lane.
- Following Entered Vehicle ID - Unique ID of the followed vehicle in the waiting lane.
- Video Position of Following Vehicle Entry [ms] - Time, when the first waiting vehicle left the waiting queue and the following vehicle became the first waiting vehicle.
In case gap time is sufficient enough for more than 2 vehicles to enter the waiting lane, the following columns are repeated:
- (If Entered Vehicles Count > 1: list(Tf Value [ms]))
- Reaction Time [ms]
- Following Entered Vehicle ID
- Video Position of Following Vehicle Entry [ms]
We will be happy to answer any questions you may have. Contact us!