Nearly 14.5 million voters are eligible to decide the fate of 808 candidates. Most of the 14,170 polling booths are in the rural areas. The six districts where polling will be held are Patna, Saran, Vaishali, Nalanda, Bhojpur and Buxar.
Voting started at scheduled 7 AM in 14,170 polling stations spread in six districts of Patna, Vaishali, Saran, Nalanda, Buxar and Bhojpur districts.
Polling would end at 4 PM in 10 constituencies due to security reasons and at 5 PM in the rest 40 constituencies, Additional Chief Electoral Officer R Lakshamanan said.
The prominent politicians, other than the two sons of Lalu Prasad, whose fate would be decided in this round are BJP leader Nand Kishore Yadav (Patna Sahib), ministers Shyam Rajak and Shrawan Kumar from Phulwari and Nalanda seats respectively, Deputy Speaker Amarendra Pratap Singh (Ara) and BJP's chief whip in the state Assembly Arun Kumar Sinha (Kumhrar).
The staggered elections to pick a 243-member Bihar assembly will end on November 5. The result will be revealed three days later.
In the first and second phases of the elections on October 12 and 16, polling was held in 49 and 32 constituencies. The fourth round will be held on November 1.