Spotted on the Thanet way

A strange blue object appeared on the Thanet way last week just near the M 2, it looks a bit like a portable toilet but maybe it is something more significant.

Surely if this was just a work site toilet then it would not have been necessary to close off 2 lanes of the road during the preceding week before its arrival and since up until last Friday there was no sign of any workers just what is the mysterious blue box.

Please note that I took the photograph from a passenger seat, I only mention this as readers have in the past criticised my driving abilities. Also I haven't been along the Thanet way this week so maybe this object has been joined by contractors actually working in the closed off lanes.

The roads authorities would not add ten minutes to the journey home just through incompetence would they?