• AS I see it, the bus driver’s problem is that air from the bus side of the partition migrates to the driver’s side, carrying any infected droplets that may be around.

If the cab is maintained at a slightly higher air pressure than normal, then this will not happen. Any air migration will be in the other direction.

A small three-inch diameter 12volt fan (as one might find in the rear of most computer system boxes) could be mounted in the window space to the driver’s right-hand side, blowing air into the cab. It should then do exactly that.

The window should be slid back a bit and a plexiglass panel with the fan mounted should be fitted within the runners and the sliding window slid in order to make that area air-tight.

The surface on the other side, the passenger side, should be made air-tight with a suitable material.

Precisely where the 12v power comes from, I’m not so sure about. There will be ready access somewhere in the cab behind the instruments somewhere.

There are various bus types around. The ones that I’ve seen should suit this proposal but some modifications may be needed. The fan may need to be bigger and experimentation may be needed to see if the effect is spoiled by leaks here and there.

This system could be replaced by a compressed air cylinder which would have to be recharged every so often. I sent this proposal to the Mayor of London and have yet to receive a reply.

PETER RUTHERFORD
NW6