That road looks a bit scarey
Not too bad actually, and I never ride more than a couple of miles on that part of it. It is fairly busy, but it quite wide, with good visibility. And a 50 limit at that point.
It is actually a B road (B4265), but really should be an A road, with the traffic that uses it and the quality of the road. It runs from Bridgend to Cardiff Airport (though not the signposted route to the airport).