I think so. The A406 carriageway towards Ealing Common remains two lanes
wide for quite a distance, just enough I calculate to "land" a single lane
flyover with room for a lane leading off from the roundabout. Bear in mind that
most of the traffic at present leaving the roundabout for Ealing has come off
the A406. The benefit of such a flyover is that not only would it substantially
reduce the total number of vehicles using the roundabout but, more crucially,
it would reduce the number of vehicles stationary on the roundabout, stopped
by infernal traffic lights and thereby impeding the flow of other traffic. But, as
I said before, it would be a tight squeeze.