Diversions Sunday 3rd March

The Cambridge Half Marathon is on Sunday 3rd March and will result in a number of diversions to Stagecoach buses.
Full details can be found at here.
This is what it says about Busway routes:

Busway A/B Services - 

Towards Cambridge: We will be unable to serve stops located on Castle Street, Round Church Street, New Square and at Drummer Street Bus Station until 10:30. During this time, passengers are advised to board at Milton Road (near the Westbrook Centre) or on Victoria Road. After this time, we will be able to serve Round Church Street and Drummer Street bus station. We will return to normal service from 16:00.

Towards St. Ives: We will be unable to serve Drummer Street bus station, New Square, Jesus Lane and Castle Street bus stops. During this time, passengers are advised board at Milton Road near the Westbrook Centre. We will return to normal service from 16:00.

But, please note, service A no longer runs on Sundays. It has been replaced by the D route, but that information seems not to have reached whoever compiled this update.