Now, let's put our formula into practice by calculating the trip distribution for Zone 1. We know from our data that Zone 1 has a total production (P 1) of 5,000 trips.First, let's calculate T {1 1}, which are the trips that both start and end in Zone 1. We take our 5,000 productions and multiply them by the friction-weighted attraction of Zone 1 (2000 times 0.145) divided by the total accessibility of all zones. After running the numbers, we get 2,996 trips.Next is T {1 2}, trips going from Zo