The council says maintenance work on the A361 North Devon Link Road starts from Sunday.
It comes after a number of centres were temporarily shut due to suspicious or dangerous items.
Businesses say the latest road closure will amount to a "death sentence" for traders.
The new project is using art and music to help transform the city's anti-social behaviour hotspots.
About 400 people walk between the Devon villages in support of a campaign to get a road repaired.
Devon County Council says it will invest £1 million in libraries across the county after consultation.
A Devon councillor says people should stop "pointing the finger" and fix potholes themselves.
The future of the library service in Devon will be decided by the county council.
Devon County Council is looking at changes to library opening hours and more volunteer involvement.
