Very close to home this one, I've ridden this road and shared path on hundreds of occasions, from end to end it's about 1.5mile.
The shared path is good in that it's wide, the surface is good and it's not very busy with peds. However, it is frequently strewn with glass, I would guess that over 50% of the punctures I've had have come from this one stretch of path.
The road is nightmare. It's busy and it's fast, although usually only one way at a time, and the lanes are not very wide. At peak times it will be pretty much queued from one end to the other either going into or out of Haverfordwest. It is very unusual to see a cyclist use the road, there are usually a fair number on the path. If you use it, which I do occasionally, you will get abused and you will get close passed, I have never used this section of road without at least one motorist telling me to "Get on the flipping cyclepath" or close passing me, usually both.
The man's a tit and the sentence is too lenient. I hope the cyclist has a speedy recovery and sues the arse off him.