A new report by the Oxfordshire Innovation Engine, which was commissioned by Oxford University, the Oxford Trust and the local enterprise partnership, found congestion was one of a number of key issues which need to be addressed to help firms grow.
According to the report, the capacity of the roads around the county remains a key concern of businesses.
Many of the organisations interviewed for this update expressed concern about road congestion, particularly on key strategic routes, the report states.
It singles out congestion on the A34 as an on-going concern and adds the average journey time per mile in Oxford city centre has risen from 5.58 in 2010 to 6.22 in 2014.
A spokesperson for Oxfordshire County Council said the