One lane of a main Croxley Green road is due to be shut today and Friday so work can be carried out on a variable message sign.
Motorists can expect delays as part of the A412 Watford Road is closed, near Beggars Bush.
The work is being carried out by Ringway on behalf of Hertfordshire County Council.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here