I certainly wouldn't choose to go that way in the
rush hour, having experienced queues up to the
White Hart roundabout to a small extent and,
to a much larger extent, up to the Target roundabout,
with that peak hours bus lane taking
out half of the road capacity when it's needed most!

Generally the capacity of a road is limited by the capacity of the
junctions. If the bus lane doesn't reach the most restricted junction, it
doesn't reduce the capacity at all - it actually increases the capacity by
encouraging certain drivers to get the bus instead, leaving more capacity
free for people who can not reasonably use the bus for their particular
journey.

All very well if any of that was relevant to this case. Unfortunately it
isn't. The Target roundabout's a very busy roundabout with a lot of people
going straight on towards Northolt station and Harrow, and a very heavy flow
of traffic taking the Eastbound A40. The traffic needs to be separated into
different lanes for a lot longer than the very short distance between the
end of the bus lane and the junction. And the bus theory would work if at
least 50% of drivers did take the bus. Unfortunately, for probably the vast
majority of the drivers, taking the car is far quicker than using the bus,
so that's not going to happen, and the congestion stays.

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