Engineers are fixing a gas leak under a busy road near Redbourn.
At about 10.30pm yesterday, gas supplier Cadent sent out workers to fix a problem under Redbourn Lane, between Redbourn and Harpenden.
Temporary traffic lights have been put up while the leak is plugged and fixed.
A spokesperson stressed that the situation is under control and safe.
A Facebook announcement said: “We know this is a busy road and it’s going to cause disruption, but hope you understand this is necessary and essential work to keep everyone safe.
“We will get this fixed as quickly as we can.”
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