A protest occurred in Kano city following an alleged attack on a driver by an official of the Kano State traffic agency (Karota).
The incident happened along Ibrahim Taiwo road in the city.
The cause of the conflict between the official and the driver is yet to be ascertained.
Other trailer drivers, in a show of solidarity, blocked the busy road.
The Karota officials fled the area after protesters started chanting derogatory language against them.
The police later arrived and took the injured driver to a hospital.
The protesters, led by trailer drivers, blocked the post office road for hours on Tuesday.
But the police said they have restored normalcy in the affected areas, and motorists can now return.
Meanwhile, the Kano police spokesperson, Abdullahi Haruna, said the traffic official who allegedly assaulted the driver has been arrested.
“He is currently being interrogated at the police headquarters in Kano,” he said.