The Queen Emma Bridge is a pontoon bridge connecting pedestrian traffic between two sections of Willemstad Curacao. The bridge is hinged and opens regularly to enable the passage of oceangoing vessels. On the opposite end from the hinge is a small shelter where an operator controls two diesel engines turning propellers. The propellers are mounted perpendicular to the length of the bridge and allow it to swing parallel to the shore. The process only takes a few minutes to complete, although the bridge can remain open for much longer depending on ship traffic.