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Moving passenger and freight traffic to trains is a strategy often suggested by environmental groups as a way to alleviate road traffic. This approach leverages the efficiency of trains, which can transport large numbers of passengers and significant amounts of freight over long distances with a reduced environmental impact compared to road transport. Trains produce lower greenhouse gas emissions per capita compared to cars and trucks, contributing to a decrease in congestion on the roads.

Additionally, rail transport can provide a more sustainable alternative that reduces reliance on fossil fuels, making it a more environmentally friendly option. By shifting traffic from roads to rail, environmental groups aim to minimize pollution, lower traffic-related accidents, and enhance accessibility, thereby promoting a more sustainable transport system that mitigates the adverse effects of high levels of road traffic on urban areas.

The other options, while they may have their own merits, do not align with the goals of reducing road traffic and environmental impact as effectively as increasing the use of trains.