The function exist\_state is used with the boolean proposition travel\_time\_i\_sup\_n and its associated heuristic function heuristic\_hestimate\_travel\_time.
0 is the identifier of the vehicle and 158 is the excluded lower bound for the proposition to be true.
Here is another example where the query EF ttc\_A\_B ≤ 0 is checked.
The function exist\_state is used with the boolean proposition ttc\_i\_j\_inf\_n(0,1,1) and its associated heuristic function time\_to\_overtake\_i\_j\_inv.
0 and 1 are the identifiers of the vehicles and 1 is the excluded upper bound for the proposition to be true.