Motorists are being warned about delays along one of the main routes into Rickmansworth.
Ringway started relocating bollards outside the entrance to the Royal Masonic School on the A404 Chorleywood Road earlier today.
The work is being carried out to stop cars from pulling in outside the school.
The work is expected to be finished on Monday, November 3 and authorities are warning that delays are likely while they carry out the work.
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