In message , at 12:09:36 on
Sat, 19 Dec 2015, David C remarked:

Please forgive my ignorance, but what is / was intended for Ely North
junction?

But there was some mention of a problem on BBC Look East last week,
but no explanation.

It currently has four "single lead" junctions (a, b and c).

Only the Peterborough direction has a full two-track junction.

https://goo.gl/maps/3JziEjRARYF2

So it's like this:

Ely ------------------------------------ Peterborough
\
Ely ---------a-------------------------- Peterborough
\
*
\
b------c--------------- Kings Lynn
\ \
\ -------------- Kings Lynn
\
d------------------ Norwich
\
----------------- Norwich

As is fairly obvious, places like "*" are a monster bottleneck.
--
Roland Perry