In summary, our microscopic models of IDTBT, validated against experimental GIWAXD measurements, predict a non-crystalline structure (i.e., no chain stacking as often observed for semi-crystalline polymers) for IDTBT; however, BT crossing points with a significant relative perpendicular local orientation of chains result in a mesh-like morphology for the polymer. This can reconcile the two (apparently contradictory) observations of "amorphouslike structure" and existing of a "remarkable short-and medium-range order and unconventional packing" for IDTBT. Furthermore, these crossing points are shown to be efficient interchain charge transport sites so that for polymers with sufficiently large molecular weights several charge carrier pathways exist. Thus, our models suggest that the extraordinary charge carrier mobility of IDTBT is not only due to the great intrachain charge transport but the existence of effective interchain transport sites throughout the material (provided by BT-BT π-π interactions) can significantly contribute to the overall mobility.