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How can I insert arrows on flows and export flows map with arrows indicating their direction in R?

I know that I can use the arrows command of the maptools library to "print" an arrow in line with the flow indicating its direction, but unfortunately, the command arrows only works after the command plot("object that contains the map") run. When I export the map, of course the arrows are not exported because they are not part of the shapefile that is generated by writeLinesShape command.

So, is there any way this be done?

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You cannot save arrows in a shapefile. Drawing arrows depends on the software you want to import the exported shapefile. For example in ArcGIS you can simply define a symbology for the line feature to have an arrow along the direction that the linear feature is sketched.

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