Summary from English
Wikipedia (enwiki)
Second Harbour Crossing is the name given to the proposed second transport link across the Waitematā Harbour in Auckland, New Zealand. The second link would supplement the Auckland Harbour Bridge which is nearly at capacity and also provide more redundancy and public transport linkages between Auckland City and North Shore City. It is sometimes also called the Third Harbour Crossing, as there is already an Upper Harbour Bridge (or Greenhithe Bridge). More recently, it is named Additional Waitematā Harbour Crossing (AWHC) in planning documents.