While intercity passenger transport counts for about 2% of the total passenger transport volume the share of the total passenger kilometers traveled is estimated more than one third. In many countries the major part of intercity transport is performed by car and air and as a result, the...

Transportation contributes to roughly a fifth of greenhouse gas emissions, and as a growing sector of the economy, its contribution to climate change, if remained unchanged, could even grow. This is particularly true in the developing world, where the growth rates of air and ship transport are...