Drivers in Oxford are facing long delays while vital work gets underway to repair an ancient bridge.
The Grade Two listed Folly Bridge - on Abingdon Road - is one of the busiest routes in the city, with around 15,000 vehicles crossing it every day.
The work can only take place during certain parts of the year because at times bats live underneath the structure.
Drivers in Oxford are being advised to plan their journeys as work begins on one of the main routes into the city today.
Folly Bridge has been partially closed for four weeks for repairs from today. The stone bridge over the River Thames - which carries the Abingdon Road south from the town centre - is down to one lane.
Stonework on the bridge's arch has been damaged as a result of water penetration and frost over the years, meaning repairs are essential. The council says the works have to be done at this time - due to the presence of bats - a protected species - which can only be excluded from the structure at specific times of year.
It's hoped the repairs will be completed by 20th October - in time for the Westgate Centre's re-opening.
Public transport operators are warning of disruption to services:
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