They can be the bane of the morning commuter, causing traffic jams and delays throughout the capital. But could roadworks soon be a thing of the past? A new robot has been built that can repair leaking gas mains without the need to dig up our roads.
Today it was given its first test ride in London, and Dan Hewitt went along.
New robotic technology which can carry out repairs to leaking gas pipes from the inside is being tested in London. If successful, it means repair work can be carried out without the need for disruptive roadworks.
See the robot in action below.
Residents in Enfield who were evacuated from their homes after a gas leak describe what happened.
More than one hundred people were evacuated from their homes in North London this morning after a gas leak.
Residents in Enfield were told to leave their houses in the early hours. Police, ambulances and fire engines were all called to the scene.
The leak was caused by road maintenance work in the area. The residents are now back in their homes, and no one was hurt.
A man has been hospitalised after inhaling gas at a building in Harlow. Ambulance crews and a hazardous area response team found the man, who is in his 90s, and took him to the Princess Alexandra Hospital.
London Tonight has discovered that a high security fence is being built around a gas plant in Hertfordshire. The plant is tucked away in woods.
It's believed the site supplies gas to north London and Stratford - including the Olympic park. Around one hundred workers are erecting a fence around the site.
Work will continue there for the next five months.
The National Grid said in a statement: "We carry out robust security in conjunction with the Government and LOCOG [The London 2012 Organising Committee]."