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In these cases, both have been captured in this dataset. Features in this dataset that are over tunnels have a [RECTYPE] of \"1\", while features that are in tunnels have a [RECTYPE] of \"2\". Presumably, this was done because both roads could be blocked if the tunnel was destroyed. In some cases, the NBI only represented a tunnel with a record of type = \"1\" (over). In these cases, the following rules were applied: 1) If there was no road running through the tunnel, the road on top of the tunnel was captured. For example, if a mine conveyor runs through the tunnel and a county highway runs on top of the tunnel, the county highway was captured. 2) If a road ran through the tunnel, then this road was captured and the [RECTYPE] was changed to \"2\". The \"feature carried\" and \"feature intersected\" fields were also changed to be consistent with the feature actually captured. 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