Beware the clowns, er, cones!
For two days running there have been stray "safety cones" in fact CAUSING a hazard in the underpass where Victoria Embankment (eastbound) crosses under the Blackfriar's Bridge. These cones have been left in the carriageway rather than being appropriately stored when not in use.
The irony is deep, when tools meant to be used to improve safety are mismanaged to the point that they primarily serve to CREATE A HAZARD.