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    # join the people threads and collect statistics
    my ($total_wait, $total_ride, $max_wait, $max_ride) = (0,0,0,0);
...
        $max_ride    = $ride1 if $ride1 > $max_ride;
        $max_ride    = $ride2 if $ride2 > $max_ride;
    }

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

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