The first full week after the Government urged people to Stay at Home on Monday 30 March saw traffic crossing the city's Wearmouth Bridge drop by two thirds (62 per cent).
Traffic then fell from a daily average of 25,566 vehicles in the week before the Government advice to a daily average of 9,675 by Monday 6 April.
Bridge and traffic on St Mary's Boulevard then began to rise with St Mary's recording a daily average of 10,346 vehicles in the week beginning Monday 13 April, compared to 10,032 in the first full week of lockdown.
Traffic flows for May on St Mary's Boulevard are now around half (50 per cent) of what they were before the lockdown. An increase of 12 per cent.
Sunderland City Council's Cabinet Member for Environment and Transport, Councillor Amy Wilson said: "While traffic flows have increased, possibly as some people go back to work, they are still half of what they were before the lockdown as residents follow the Stay Safe guidance and continue to support the restrictions.
"There are still many points to consider before you leave the house and travel.
"Ask yourself is your journey in a vehicle really necessary? Advice about working from home where possible has not changed and, if you can, please shop locally and shop less frequently."