The Breach Count analysis is to detect and count instances of pedestrians breaching physical distancing. This is an alternative module to the level of service or density maps in that it focuses on the individual instances of breaching as opposed to the average concentration of people over space. The module differentiates between three different levels (severity) of physical distancing breach. It gives more weights to the more sever breaches in the total count.
At each time step, the breaches are detected and then the counts are accumulated over all time steps of the simulation. These counts are then aggregated across various units of a grid system (i.e., 1m*1m grid currently used in DT) and visualised in a colour-coded system.
The advantages of the method are that:
- It takes individual interactions into account (i.e. actual instances of distancing breaches)
- It takes into account the intensity of breaches. (Very) acute breaches are counted (three) two times as many as (simple) breaches, so they represent a higher weight.
The Breach Count analysis, however, cannot keep track of individual breaches between pairs of agents, which will be complemented in the Breach Duration analysis.