Finally, improved freight logistics and modal shifting of freight from long-haul trucks to rail have the potential to drive down the distance traveled and corresponding emissions from heavy-duty vehicles. The MCS analysis highlights two pathways to a lower-GHG transportation sector. The MCS Benchmark scenario portrays a rapid deployment pathway for clean vehicles, driven by a combination of technology improvements, policy support, and increasing consumer acceptance. By 2035, roughly half of light-duty vehicle sales are clean vehicles. Due to slow stock-turnover (light-duty vehicles can be on the road for 15-20 years), the composition of the vehicle fleet lags behind, but by 2050, clean vehicles account for over 60 percent of light-duty vehicle miles traveled, and significant (though lesser) progress is also made in clean heavy-duty vehicles.