The Cambridgeshire Guided Busway is a new bus network with a high-quality off-road path for walking and cycling. It was opened in 2011 and is the longest of its kind in the world. We took the opportunity to find out more about how people travelled to work and how this changed as a result of the busway. We found that how people travelled to work depended on many different factors, ranging from childcare to parking. We showed that, over time, people living closer to the busway were more likely to increase their cycling, and less likely to use their car, for commuting than those living further away. These changes could help to increase their overall physical activity and improve their health and well-being over time.