The Time gap is the time duration between two consecutive traffic objects that appeared on the same spot, crossed the same line etc. The shorter the time gap, the higher the frequency of the traffic in the analyzed spot. Time gaps are applicable for one movement at a time and it is advisable to use them for a single line or zone, as only the first detection spot is taken into account (i.e. when a movement goes through several zones or lines, only the first one is taken into account for the time gap computation).
One zone
Time difference between car A and the car B entering the defined zone
One line
Time difference between car A and the car B crossing the defined line
Two zones
Time difference between car A and car B entering the defined zone 1. Zone 2 is ignored for the time gap
The widget in Video Insights shows the mean time gap either as a single value or as a bar graph for a given time unit. If you are interested in all individual vehicle time gaps, they are available in our .xls reports or you can create the Vehicle list widget for that.
Examples: How busy is a street in the morning, around noon and in the evening? What is the average time gap of the vehicles in and out of the rush hour? Do drivers respect a safe distance in front of a dangerous area on the road?
Advice: Time gap in a zone or on a line is calculated based on an object crossing in any direction. If you're analyzing time gaps, be careful where you place the zone or line and check that it corresponds with the desired direction of the trajectories.
Mean time gap presented as a bar graph with 5min time unit / average time gap on the tracked spot