One taxi can only allow 4 adult and one infant. You need two taxis. Huangpu BUs Station in Nanpu Bridge? It is just very close to Bansongyuan Entrance to the expo. So, you first two questions are similar. I have no idea which part of Nanjing Road do you mean, the east or the west part. I will say People's Square which is between the west and east parts of the road, about 5-6km. The taxi cost is within 25RMB.