sub work for the construction of bitumen laboratory-ii at thanjavur in the main work of area based comprehensive road improvements, strengthening and maintenance is state highways and major district roads for a length of 208.334 km in thanjavur and orathanadu sub divisions of thanjavur ( h ) c&m division including initial rectification such as improvements and widening form intermediate lane to double lane / multi lane, double lane to multi lane / four lane, four lane to six lane, improvements including construction major bridges, widening of minor bridges and slab culverts, construction of pre cast box culverts and pipe culverts, rcc and pcc storm water drain, retaining wall, crash barrier type rcc centre medians, road safety measures to all the roads, plantation of avenue trees including upkeeping for a period of 60 months