Wayne State professor Michael Belzer, an expert on the trucking industry, is quoted in an article that examines whether paying truck drivers by the load may lead to their driving unsafely in an attempt to transport more loads in a given time span. The situation is of particular concern for drivers who haul hazardous commodities, such as gasoline and chemicals. "The carrier wants to keep the rate based on piece work so it can eliminate the risk it might otherwise have due to traffic tie-ups, weather, loading or unloading delays, or anything else," Belzer explained.