"I will flag off 1,000 Tum-Tums for campaigning to reach out to the poorest of the poor to counter the BJP raths," the former chief minister said here.
"Dozens of Tum-Tums will be engaged by our party for campaigning in each constituency."
Elections to the 243-seat Bihar assembly will take place later this year.
The Rashtriya Janata Dal leader said the horse carts were perfect for Bihar's "dusty and rough roads. Tum-Tums will help us save money on petrol and diesel".
BJP president Amit Shah on Thursday launched the party's high-tech 'Parivartan Rath' campaign for the polls by flagging off 160 GPS-fitted 'raths' here.
The 'raths' would show a video film in Hindi depicting the 15 years of "misrule" of Bihar by Lalu Prasad and his wife Rabri Devi.