Strange road sign-What does it mean?

[Orionaut]

No Photo I am afraid,

The sign is rectangular, Portrait style

It is Blue with a white border.

At the top of the sign there is an image of what looks like a satellite beaming a radio signal towards the ground.

At the bottom there is a picture of a lorry with a red bar across it.

The sign is at the entrance of a single track side road (As yet unexplored owing to current circumstances)

It is in the Hereford area.

I have never seen this road sign before anywhere else.

What does it mean?

 

[Orionaut]

Yep, that's the one. I thought it might be something like that.

It's a good idea, However, it is also a bit like the doomsday machine in Dr Strangelove isn't it?.