A light controller includes a substrate that has an optical path opening; at least a pair of blades that is reciprocally supported on the substrate and opens and closes the optical path opening; and a driver unit that drives the opening and closing of the pair of blades. The MCU resets the battery estimate SOC to a first reset SOC when the SOC reset condition corresponds to a first SOC and reset the battery estimate SOC at a second reset SOC when the SOC reset condition corresponds to a second SOC. The ball mount receiver is placed over the ball mount on the prior art hitch. When all of the nodes are ready, or at the expiration of a predetermined time interval, the application server signals the forwarding node to resume forwarding traffic to the internal processing units.