the major connecting link for the province is the mahendra highway (east west highway) which runs longitudinally across the province. all major cities of the province remain disconnected from this highway. janakpurdham, rajbiraj , birgunj and gaur lie 25,10, 24 and 42 kilometres south of the mahendra highway, respectively. the tribhuvan highway does not cross as much of the province as the mahendra highway, but it is most important link as it connects the province to kathmandu and to the india. the starting point of tribhuvan highway i.e. birgunj is the most important international gateway and trade way for this province and entire country and hence known as "the gateway of nepal". in terms of revenue generation, birgunj custom point is the largest. birendra highway which is connected to mahendra highway from headquarter of rautahat district gaur to the chandranigahapur (largest city of rautahat). which is 42 km in length.