The driver, Md Al Amin, was arrested in Munshiganj on Sunday night. He had been driving the bus without a licence over the past five years, RAB-3 chief Lt Col Arif Mohiuddin said at a media briefing in Dhaka on Monday.
The pedestrian, Md Jahangir Molla, 35, died after being crushed by one of the buses operated by Manjil Express on Saturday. The victim was a native of Faridpur's Boalmari Upazila. The drivers fled the scene after the incident.
"Al-Amin claimed in initial interrogation he had a licence, but he could not show that. After studying up to eighth grade, he began working as a driver's helper and gradually started driving himself. He had received no professional training on driving," Mohiuddin said.
"He took training from the driver while working as a helper. He has no clear understanding of the traffic rules."
Al Amin also worked as a garment worker for five years before driving. He joined the Balaka Paribahan as a helper in 2012. He started to drive the Manjil Express bus in 2017.
Jahangir, the victim, is survived by his mother, wife and four children. He used to work as a farmer.
His elder daughter is 8 years old while the little one is 4-month old. His entire family are helpless now, the RAB official said.