My guess is that originally the pavement stopped where the traffic light
is situated and that a footbridge over the A102 was constructed. I also
guess that at some stage TfL decided to move the bus stop a few yards
west of the traffic light to give buses an advantage over traffic held
by red signals. (typical TfL) and that as part and parcel of that they
extended the pavement, making the footbridge redundant.
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