He was speaking at a function to release his government's report card and mark seven years in office.
Kumar promised road links to around 1,000 rural clusters with at least 250 people and claimed 25 million citizens had benefited from the law for 'timely delivery of public services'.
The government will construct 34,100-km roads in the next five years at a cost of Rs.23,881 crore, he said.
While Kumar said Bihar was making faster strides on the path of development, opposition leaders led by RJD's Lalu Prasad called the report card a sham.
Dubbing it "wasteful talks", Prasad said, "the truth is that law and order and education system have crumbled".
Kumar, meanwhile, blamed under reporting of the number of poor people as the main reason behind the 'non-success' of welfare schemes for the BPL section across the country. "Unless you have authentic data on the poor, how can the schemes meant for them succeed?" he said.