Sixth National Highway Congress: Conclusion and Conservation Section; legislative, Administrative and Exploration Section; State of Sao Paulo and its Highway Department in 6th National Highway Congress, A. de SOUZA LIMA and R. PINHEIRO LIMA; Coordination of Means of Terrestrial Transportation, A. de SOUZA LIMA, with discussion by A. P EREIRA de CASTILHO and author's reply; Financing System for Highway Construction, Based on Taxation for use, A. PESSOA; Constitutionality of Such Tax, discussion by G. PENTEADO and author' s reply; Way and Means Suggested for Obtaining Greater Safety of Traffic in Avenues, Streets and Highways, R. CAPOTE VALENTE; discussion by P. A. BRANCO; Suggestions for Scientific Solution of City Traffic Problems; P. A. BRANCO; discussion by A. A. de GODOY; Rationalization of Highway Conservation Services, P. DUTRA da SILIA; Suggestions for Plan of Highway Conservation, E. P. dos REIS GOMES MA CIEIRA; Management of Highway Conservation Services, C. da SILVA LICH TENFELS; Highway Conservation Elimination of Transportation of Work Gangs by Construction of Houses for Laborers, C. da COSTA NEVES; discussion of preceding papers, by G. PENTEADO; Kilometer Makers, P. DUTRO da SILVA, with opinion by P. D. BRANCO; Problem of Fuel to be Used by Commercial and Industrial Vehicles, Particularly in " Hinterland" Zones Adjacent to Coast, M. PEREIRA da SILVA, with opinions of L. FLORES de MORAES REGO and J. P. ESCOBAR; Theoretical and Experimental Studies in Highway Field, C. FERRO VALLE and T. van LANGENDONCK; discussion by G. PENTEADO; Transverse Section of Surfaces of Simple Concrete Highways, T. van LANGENDONCK; Aerial Photographic Mapping as Economic Factor in Highway Location, A. MACHA DO; Areias Caxambu highway, paper by Federal Highway Commission; First Section of Highway Constructed by Federal Government in State of Sao Paulo, A. BOTELHO, Jr; Highway Pavements, paper by " Cimento Roseo, Ltd".