Even after the A14 works have been completed, you still won't be able to turn in several directions at the Girton Interchange. You won't be able to get from the A428 to the M11, from the M11 to the A428, from the A428 to the A14 westbound or from the A14 westbound to the A428.
If the Girton Interchange did allow these movements, then a lot of traffic on smaller, congested roads such as the A1303 Madingley Hill could be avoided.
An upgraded Girton Interchange would also be an excellent location for a travel hub, allowing people to park there and take public transport into Cambridge.
If you agree, add your name below and join me in demanding an upgrade to the Girton Interchange.