Analysis of major trends in U.S. commercial trucking, 1977-2002.

Natural gas vehicles : Status, barriers, and opportunities.

“…The attributes of commercial vehicles can be defined in a number of ways (Bertram et al 2009). Light-duty could refer to "class 2b" vehicles -mostly two-axle, four-tire pickup trucks equipped with either a gasoline or diesel engine.…”

“…Some fleet managers with adverse experiences remain in these positions or have been promoted and given higher decision-making authority, preventing new vehicle introductions. Bertram et al (2009) concluded that the reliability of diesel engines in medium-duty trucks provided a better explanation for their expanded use than did fuel savings.…”

“…When examining the potential for NGVs to achieve a significant penetration of the HDV fleet, we see that the commercial trucks are quite diverse. Bertram et al (2008Bertram et al ( , 2009 recently examined long-term U.S. trends in commercial truck fuel use, studying shifts from gasoline to diesel fuel. They divided commercial trucks into heavy-, medium-, and light-duty trucks, on the basis of a size and configuration accounting format used by the Federal Highway Administration (FHWA), and divided heavy commercial trucks into combination trucks and single-unit trucks.…”

Spatial Assignment of Emissions Using a New Locomotive Emissions Model

“…With increasing levels of goods movement driven by growth in imports, lower density development and lean distribution networks, goods movement is receiving more attention from federal and state agencies. , However, the legacy of planning and modeling for passenger transportation has left some critical gaps in our ability to effectively plan for goods movement.…”