# join the people threads and collect statistics
    my ($total_wait, $total_ride, $max_wait, $max_ride) = (0,0,0,0);
    foreach (@people) {
        my ($wait1, $wait2, $ride1, $ride2) = $_->join;
        $total_wait = $wait1 + $wait2;
        $total_ride = $ride1 + $ride2;
        $max_wait   = $wait1 > $wait2 ? $wait1 : $wait2;
        $max_ride   = $ride1 > $ride2 ? $ride1 : $ride2;
    }