Three works of work on a roundabout on Norwich's ring road has begun, while roadworks elsewhere in Norwich have been causing delays.
Council bosses only completed nine months of work on Norwich's Dereham Road/Sweet Briar Road roundabout in June last year, but £25,000 already needs to be spent to fix it.
The roundabout was made bigger through £1.6m of work, with the goal of cutting congestion and reducing journey times and highways bosses say the changes have sped up traffic.
But repairs are needed because lorry trailers have been running over a section of angled kerb on the roundabout which gives access to maintenance vehicles.
That has loosened the material used to reinforce the roundabout, so council bosses want to spend the £25,000 to install a concrete ring as replacement reinforcement.
Work started on Tuesday, January 8 and will last for three weeks. One lane is closed on all approaches to the roundabout, and there will be one night of four-way temporary traffic lights from 7pm on Friday, January 18, until 5am on Saturday, January 19.
Council bosses say any noisy work will be completed by 11pm to minimise disruption.
John Fisher, Norfolk County Council's chair of the Norwich highways agency committee, said: 'We know that the disruption will be frustrating for those affected and we'd like to thank everyone for their patience.
'The reason for carrying out this work sooner rather than later is to avoid the potential need for emergency repair work further down the line, which could cause unplanned lane or even road closures.'
Meanwhile work being done to improve the area around the city's Prince Of Wales Road has caused some delays.
That work, part of a £2.75m scheme, started on Monday, January 7 and will last for four months.
The bus lane in Rose Lane is being removed, but the existing two lanes for general traffic are being retained.
It includes a seven-week closure of St Vedast Street.
Konectbus tweeted on the afternoon of Tuesday, January 8 that the roadworks were delaying their buses by up to 15 minutes.
That was affecting buses on the 5, 5a, 5b, 5c and 500 routes.
Elsewhere in the city, one of the car parks for Eaton Park shut on Monday.
The car park, off South Park Avenue, has shut for redevelopment of the park's depot.
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