We will be spending a few days touring the South Island in early December. We are planning to stay overnight in Te Anau and get up early the next am to drive into Milford Sound, a trip my husband and I have done before but not with our now teenage daughter. I would like to take an early am eg 9am cruise but concerned that all the info on the Homer Tunnel talks of traffic signals from 9am-can you drive through earlier than this? We were thinking of leaving TA around 5-5.15am. Would like to be sure before I pre-book an early cruise. The overnight boats are out of our price range this trip. Thanks.