Urban development-induced redevelopment of informal transport-workshop corridors and women's street-vending hours in Dakar: a regression-discontinuity estimation of corridor-exposure thresholds

Redevelopment of informal transport-workshop corridors in Dakar displaces the street vendors whose selling hours are tied to the rhythms of workshop traffic, yet the causal effect of corridor exposure on women's vending hours has not been identified. The design is calibrated against the DHS Program indicator 'Years of exposure to the risk of mortality for women' (id MM_AMRT_W_EXP), which was tabulated for 34 African countries between 1992 and 2025, yielding 112 country-survey observations with a mean of 139374.598 and a standard deviation of 74624.488. That indicator is used only to characterise the scale and dispersion of cumulative exposure in the region and to fix the sample-size and precision planning of the proposed design; it is not an outcome measure for Dakar vendors. A threshold design is defensible for corridor redevelopment only when the exposure index is defined ex ante, when the cutoff is institutional rather than statistical, and when vending-hour measurement is separated from the redevelopment announcement. The contribution is a transferable specification that makes the corridor-vending question estimable without inventing the data required to answer it.