Trail Bridge Section (TBS) is in the Department of Local Infrastructure Development and Agricultural Roads (DoLIDAR) under the Ministry of Local Development of  Government of Nepal. It has been very recently established as a permanent section in the DoLIDAR.

Formulation of policies and strategies, issuing directives and guidelines, setting norms and standards, monitoring quality, program monitoring, enhancement of capacity at the district level, promotion of decentralization and coordination of trail bridges fall within the ambit of the TBS.

TBS is headed by a Senior Divisional Engineer. It has four engineers and other subordinate staff members.

Trail and mule tracks were the only means of transport and communication in Nepal until the late 1950s. Since then, considerable efforts have been undertaken to link important geographical and socio-economic areas of the country with roads. The rugged topography combined with highly problematic hydro-geological conditions have made this endeavor extremely difficult and a costly affair. To date a network of approximately 17,000 km of roads has been realized. Most of these roads are concentrated in the Terai, flatlands, bordering India. Till 2004, fifteen district headquarters, out of seventy five still did not have road access. The majority of human settlements located in hilly and mountainous areas of the country are not accessible by motorized vehicles or bicycles. Given the topographic and geological challenges this condition is likely to remain for many years to come. During the monsoon rains, whole valleys of the hinterland are cut-off from the road network and thus from food supply, health facilities, schools, important market and other essential services. Therefore, the socio-economic activities of these places will continue to largely depend on a trail based transport and communication system through foot trails and mule tracks with reliable trail bridges.

Trails and trail bridges have always been a priority in the development programs and plans of Nepal. The Tenth Plan (mid July 2002 - mid July 2007) of Nepal again assigned Priority-1 to the Program.

Till the end of 2006, more than 3,000 pedestrian bridges had been constructed in Nepal by different organizations and agencies. However there still remains a very significant demand for trail bridges in Nepal.

The trail bridge program forms one part of the Targeted Programs in the Tenth Plan. The basic objectives of the Targeted Programs are to design and implement the programs in such a way that they benefit the poor. The programs are continuously being discussed at the grassroots with local organizations, local governments and the general public in order to strengthen ownership of the programs and ensure successful implementation. The program will also help to increase employment opportunities for the poor by providing skill related training and opening up markets. The program involves local governments and community groups and channels resources through the District Development Committees (DDCs) and Village Development Committees (VDCs) at the community level. It also ensures mobilization of local resources through NGOs and CBOs and adequate representation of the disadvantaged groups in the decision making processes.