A stretch of the Busway, between Trumpington Park & Ride and the Foster Road stop, will be closed completely from 19.00 on Friday 25 September until Monday 28 September. This is a "complete" closure, so impacts not just on buses and their passengers, but also on pedestrians and cyclists.
There's nothing at present about this closure on the County Council's Busway website (why not???), so this information comes courtesy of a Cambridgeshire Live report - which doesn't specify exactly when the reopening is due to take place.
The closure is to allow upgrade work on the traffic lights controlling the single-track section to be carried out.