The study looked at how easy it is to access public transport in the City of London and how this affects people's choices between using public transport or driving their own cars. They wanted to see if better public transport availability could encourage more people to use buses and trains instead of driving. They found that when public transport is convenient and reliable, more people tend to use it, which helps reduce the number of cars on the road. This suggests that improving public transport services could lead to fewer private car journeys and more sustainable travel choices in the city.