Due to the construction of the bridges and parts of the road being in England and parts being in Wales,nobody has control, and to now widen the 2 or 3 bridges would cost a lot of money, and result in a long term roadworks, they should either install speed cameras,(mobile one sometimes on the bridge over the dualed bit going up hill,towards Wrexham),and some seriously dodgy junctions, two level crossing for disused railways, and a load of muppets,stuck behind LGV,s doing 40 mph, doesnt help.
There is also a lot of encroachment onto the sides of the road stopping the road being widened,without buying out the relevant owners,again very costly.