A system and method for efficiently and continuously allowing vehicles to travel through an intersection. The system comprises an article, an electrically-powered device and a controller. Lateral ultrasonic wave 9b is reflected by the ultrasonic reflecting material 38, and, as lower ultrasonic wave 8, advances along the wall surface of the reaction vessel to collide with the specimen liquid level, thereby causing a part of the liquid level being closer to the piezoelectric element 35 to be raised. The thermoelectric and mechanical properties of the compositions make them well-suited for use in thermoelectric applications.