A collection of environmental conditions:
entering / exiting village,
double Hill,
various road markings,
camera signs
Google :
https://maps.google.co.uk/maps?saddr=A4 ... ra=ls&z=16and the accident location here:
https://maps.google.co.uk/maps?saddr=A4 ... 5,,0,-1.92So its coming into a 'cushion' 40 from 50 that then leads to a 30.
Down hill into the 40.
We can only ponder if it is the speed limit change that has acted as a factor in this incident.
Could be some or several other factors too of course.