Zoe Chace is part of the Planet Money team that's in Bangladesh, following the trail of the Planet Money T-shirt. She posted this to our T-Shirt Tumblr:
The streets of Chittagong, Bangladesh are overcrowded with cars, rickshaws, and big trucks. Traffic can be a serious problem for clothing manufacturers that need to get their shipments to the port on time, so the big garment factories here use special vehicles to cut through the traffic. The marking "Emergency Export Duty" gives these trucks the same rights as ambulances: They don't have to follow any traffic laws and they can use alternate routes when roads are closed. The timeliness of a T-shirt order is this city's livelihood.