Southbound traffic, on the left, is allowed to move on the Parks Highway near Willow, Alaska, Monday, June 15, 2015, while northbound drivers wait their turn to be escorted through an active wildfire area. The fire north of Anchorage has led to the voluntary evacuation of up to 1,700 structures and has struck the heart of sled dog country, including 15 or so mushers who call Willow home. (AP Photo/Mark Thiessen)