This document summarizes Colin Buchanan's career and influential publications "Traffic in Towns" and "Transport in Cities". It discusses how Buchanan established an analytical framework for transport planning in "Traffic in Towns" that considered land use, major road separation, environmental standards, accessibility and cost-benefit tradeoffs. While some criticized aspects of "Traffic in Towns", its overall framework and many policy recommendations remain applicable today. The document then introduces "Transport in Cities", noting how urbanization, technology, economic and environmental factors pose new questions. It outlines scenarios around these trends and concludes that while "Traffic in Towns" was remarkably insightful, "Transport in Cities" aims not for answers but an updated framework for thinking about transport