Motorists have been warned of delays as works take place this week.
There will be delays in Watling Street until Thursday as BT replace a jointbox.
Crossway in Harpenden will have traffic control in place from the junction at Manland Way to Manland Avenue until tomorrow as micro surfacing takes place.
Eastmoor Park in Harpenden will also have traffic control in place until Thursday at the junction from Cravells Road to the end.
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