An overview:

When a council adopts a road, it means they take legal ownership and responsibility for its maintenance and repair, turning a private road (not funded by public money) into a public highway, meaning the authority handles upkeep like resurfacing, drainage, and lighting, making it a publicly maintained road.

For new developments, this happens through agreements with developers after construction meets standards and a maintenance period, while existing private roads might require owners to fund upgrades before the council takes over.