Hello TheSwavu
Good pick up! I can't provide a reason - I guess it was a whoops! I remember viewing the street and noting the various connections between the highway and the service roads - but still can't explain my error. (Duuh!) 
I have just reinstated the connections with their Turn Restrictions (due to the centre median).
And ... added the nearby Unmarked Crossing and Speed Bump on service rd.
Thanks again. 
Cheers