I expect so, as a site is needed for M11>A11
There is also a GridServe planned for Bar Hill
Even then A14>A428 will not be covered
A428 has Wyboston at the other end of it, only 17 miles further. Also, if Bar Hill Gridserve does get built in the expected location, it's easy to get back on the A428 after diverting there (a couple of miles on minor roads, but no net increase in distance).