Because road transport accounts for a significant proportion of the UK's carbon emissions. If we want to avert catastrophic global warming then the UK will need to reduce carbon emissions by 80% by 2050.
Amongst the other things we will need to do to achieve this is to bring about a massive shift away from car use, and instead get people to walk, cycle and use public transport.
Amongst the other things we will need to do to achieve this is to bring about a massive shift away from car use, and instead get people to walk, cycle and use public transport.