美国威斯康星州克兰顿镇上的狼河大桥曾经因为道路的湿滑而闻名。在冬季这里交通事故频发,尽管一下雪工作人员就在路面撒上石盐,可是盐粒很快就被来往的车辆带走了。为了解决这一问题,路政人员向土木工程师拉斯·阿尔杰寻求帮助。阿尔杰是密歇根技术大学积雪研究所的主任,他发明了一种效力持久的路面密封剂。这种物质能够显著地降低路面的冻结温 The Wolf River Bridge in Clanton, Wisconsin, was once known for its slippery roads. In winter, traffic accidents are frequent here, though snow workers sprinkle salt on the pavement, but the salt is quickly taken away by the vehicles coming and going. In order to solve this problem, the chief of staff sought the assistance of civil engineer Russ Alger. Alger, director of the Institute of Snow Science at the Michigan Technological University, invented a long-lasting pavement sealant. This material can significantly reduce the freezing temperature of the pavement