The Lower Saxony State Authority for Road Construction and Transport in Wolfenbüttel points this out.
The work is expected to last until December 23.
A detour via the villages of Lesse, Berel, Burgdorf and Osterlinde - and vice versa - will be signposted.
Weather-related delays in the construction process are generally possible. The state authority asks all those affected for their understanding in the coming weeks.