The Traffic and Health in Glasgow study (also known as the M74 study) is a quasi-experimental study of changes to the urban environment consequent on motorway construction in deprived neighbourhoods in Glasgow.

It is a mixed-method study, using a combination of quantitative (longitudinal and cross-sectional) and qualitative research methods to evaluate both individual- and population-level changes in health and health-related behaviour and to develop an in-depth understanding of how these changes are experienced and brought about.