MOBILE TRANSACTIONS ARCHITECTURE learns from Lagos' "publiccongestion" infrastructures to create a new architectural typology: The drive through market, an intensification of the interchange market phenomenon. It anticipates a greater densification of the Lagos megalopolis by appropriating the site of future superstructure abutments connecting the Island to the mainland. The principal design approach renegotiates and de-optimizes the existing motorway interchange geometry and technology to facilitate a flexible and dynamic public space of both mobility and commerce activity, giving Lagos a liberating opportunity to legitimize informal street trade and regularize its economy. This thesis projects an ambition for an architecture of percolation, a flowscape that simultaneously accommodates conveyance and interaction to facilitate an unprecedented magnitude of collective inhabitation