Herts Highways contractor to use CCTV to look for source of problem after water firm Affinity has checked for leaks.
Archaeologists' 2019 finds are being publicly documented now as the new road north of Little Hadham nears completion.
The most common time for males to roam is at dawn and dusk, which in October coincides with morning and evening rush hours.
The large piece of Hertfordshire puddingstone has been given pride of place in Little Hadham.
First passengers will be able to book journeys on Herts Lynx – covering seven towns and dozens of villages – from Sunday (19/11).
“Many people are committed to reducing their carbon footprint, but Insulate Britain are hitting the wrong target and turning the public against them."
Six men and three women holding banners sat across the road blocking access from the B1256 Takeley road to the A120/M11 junction 8 roundabout.
Charlie Cornish: "As long as vaccinated travellers have to pay for tests, the recovery of one of the UK's major industries will be held back."
The hub served just over 2.18 million passengers in June to August compared with nearly 8.3 million over the same quarter in 2019.
The Government is consulting on its plans to continue to allow an average of 37 flights a night – between 11.30pm and 6am – until 2025.