A traffic mirror at the Guildhall Junction?

Of course the Guildhall looks much different now, and so do the roads around it: faster and busier, especially the main road going past it. This makes it tricky for people turning out from the High Street because you can't see the traffic coming from round the corner.
The proposition is whether a traffic convex mirror near the Guildhall would be helpful, and meetings with County Highways are being planned. We may need planning permission, and I'm talking to the district.