Round the clock lane closures on a major through route look set to throw Watford into traffic turmoil for nearly an entire month.

Starting this Sunday (August 13), the A411 Beechen Grove will be partially closed to enable Ringway to carry out traffic light refurbishments.

The works are expected to be completed by September 8 – nearly four weeks later – with Hertfordshire County Council warning motorists to expect delays for the duration.

There will also be some carriageway incursion into Water Lane.