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  local function onTick(event)
    if global.destroyNextTick[event.tick] then
      local pis = global.destroyNextTick[event.tick]
      for _, pi in pairs(pis) do
        GUI.destroyGui(game.players[pi])
      end
      global.destroyNextTick[event.tick] = nil
    end
    for i, farl in pairs(global.farl) do
      farl:update(event)
      if farl.driver and farl.driver.name ~= "farl_player" then
        GUI.updateGui(farl)
      end
    end
  end
--snip
  function onPlayerDrivingChangedState(event)
    local player = game.players[event.player_index]
    if (player.vehicle ~= nil and player.vehicle.name == "farl") then
      if player.gui.left.farl == nil then
        FARL.onPlayerEnter(player)
        GUI.createGui(player)
      end
    end
    if player.vehicle == nil and player.gui.left.farl ~= nil then
      FARL.onPlayerLeave(player)
      local tick = event.tick + 1
      if not global.destroyNextTick[tick] then
        global.destroyNextTick[tick] = {}
      end
      table.insert(global.destroyNextTick[tick], event.player_index) 
    end
  end
--snip
  game.on_event(defines.events.on_tick, onTick)
  game.on_event(defines.events.on_player_driving_changed_state, onPlayerDrivingChangedState)