Cohort longitudinal study in Cardiff, Kenilworth & Southampton into the effects after 1 and 2 years of newly introduced infrastructures for walking and cycling on CO2 emissions from transport. The infrastructures studied were those introduced by the Sustrans Connect2 project. The project also aimed to assess the impacts of these new infrastructures on public health outcomes such as BMIs. The study found that the new infrastructures had no significant causal link with changes in commuting behaviours and public health outcomes.