Small & medium contractors are employed by various construction departments or corporations of State or central government. For example contractors engaged in building roads through Bihar State Road Development Corporation or through Road Construction Department, Government of Bihar. Similarly if any contractor is engaged in construction of bridges, the same shall be engaged by Bihar Rajya Pul Nirman Nigam Limited. The above example relates to the state of Bihar, similarly the contractors can be engaged in various states through various state/central PSUs. Central government PSUs include Railways, CPWD, NHAI etc.