I got this reply from the Environment Economy and Culture Directorate, County Hall in Exeter,which I found very helpful:-
In the final scheme there will be 3 way lights covering the stretch outside the library and the junction with Highweek Way. This work is due to start sometime in March.
So we have an Eighty yard long section of road that will be controlled by traffic lights at either end some time after March next year. Which is what we have now. The questions raised are, Why? and Why not just widen the road so traffic can drive both ways at the same time? and How long will this work take? and Can I have a look at the original plans please because I am still convinced some one made a Cock Up and is not prepared to admit it.