Disruption is expected to continue until Friday as part of gas works in Great Yarmouth.
Hall Plain will be closed from the junction of Regent Street in a south easterly direction for a distance of 30 metres.
Row 71 will also be closed from the junction of Hall Plain to the junction of Howard Street South for new gas connection works.
There has been disruption on the roads as cars try to get to the King Street car park but are unable to.
A diversion is in place via Regent Street and Howard Street South.
There is another diversion in place from Bridge Road, via North Quay, Fuller's Hill, Temple Road and Tower Hill to get to Howard Street South.
One-way traffic has also temporarily been suspended on Greyfriars Way as part of the changes.
Next Wednesday until Friday there will be road works on South Quay to carry out road repairs, with traffic controlled by stop/go boards.
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