Failed broadband(?) trench in road

There's a concreted over trench that I can only assume is from when the streets were being dug up for all the broadband works recently carried out. The trench runs right across the road carriage way and it is cracked and failing, there's several patches that have dropped causing a pothole situation but they look like they could fall deeper still as the broken pieces rock and move even with just a foot on them, let alone cars driving over them.