Terrible. RIP. I've been down that stretch of road in a car remaining well within the speed limit and even then it is scary enough due to the antics of many of the other speeding maniac motons.
The A38 is certainly a fast road and motorists do travel at excessive speeds along it. I've walked along the footpath of the section in question and it can be very unnerving.
The report is unclear whether Sapphire turned out of Common Road and was actually riding onto the A38 or was negotiating it on foot with her bike. Personally I would never contemplate doing the former, the traffic, even if it was travelling below the speed limit would be far too risky given that it's a dual carriageway.
* Not apportioning any blame on the cyclist or indeed casing judgement either way on the motorist, the news article is not particularly clear in its reporting. Very sad that anyone should be involved in such a tragic incident, whatever the circumstances might be.