How the Graph is build?

Hi there,
I’m trying to generate a simple graph using OSM. I’m using as base the Graphhoper API, but there is too many structures for me to understand. for example: whats the difference between the TOWER nodes and PILLAR nodes? why the preprocessing of ‘highways’ tags ?.


You can have a look at documentation. For example:
What are pillar and tower nodes?


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thanks. Now i understand how to generate the graph, but i’m facing a problem to find out the direction of a way, for now i know if the the way its oneway, but how can i know if the direction is reverse ?