A lorry and bus blocked traffic in Old Market Square, after an apparent collision.
The Nottingham City Transport bus and the lorry blocked off Friar Lane just after 10.30am on Wednesday.
A tweet from NCT said the lorry broke down on the street and the bus had got stuck.
Navy Line buses will stop at Maid Marian Way whilst the incident is cleared.
Due to a broken down lorry on Beastmarket Hill, Navy Line buses to Clifton will use Maid Marian Way, stop M2, as a terminus.
— Nottm City Transport (@NCT_Buses) September 10, 2014