The code as shown is not deleting any records. Also, the filehandle DAT is opened for writing, but never closed: close $output; should be close DAT;. But I suspect the real problem is in the line:
next if ($field, $field) = ($delroadName, $delroadNumber);
Perhaps you meant:
next if $field eq $delroadName && $field == $delroadNumber;
Note that = is for assignment. To test for equality, == is used for numbers, and eq for strings.
Also note that $field is the second field, as arrays start from element zero. (Your code may be correct here — I only mention this as a point to double-check.)
Hope that helps,
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