The iConnect (Impact of COnstructing Non-motorised Networks and Evaluating Changes in Travel) study aims to measure and evaluate the changes in travel, physical activity and carbon emissions related to Sustrans' Connect2 programme, which is an ambitious UK-wide project that will transform local travel in 79 communities by creating new crossings and bridges to overcome barriers such as busy roads, rivers and railways, giving people easier and healthier access to their schools, shops, parks and countryside.