Frustrated truck drivers at the port of Oakland held their second picket line in two months this morning to protest long waiting times that cut into earnings, the high cost of meeting new air quality standards, and dehumanizing treatment while in the Port waiting for loads. By law, the over 4,000 truck drivers who haul containers to and from the Port are not employees. Rather, they are independent contractors who maintain their own rigs, and pay all their own fuel and maintenance costs. Their income depends on the number of loads they can haul everyday.