Didn't see this thread until just now but I'm glad someone posted it. I wasn't on Route 9 specifically but I had something very similar happen on the A48 outside Bridgend about three weeks ago. Left the house at half nine, pulled into my driveway and it was gone midnight. I genuinely cannot account for the missing time and I've been going over it ever since.
What gets me is the physical side of it - I had a headache for two days after and a kind of buzzing in my left ear that I still get occasionally. I've done EVP work for years so I know what auditory stuff can and can't mean, and this felt different.
Would be really interested to know if anyone on Route 9 experienced anything physical afterwards. And what time did it happen for you? The window of time matters I think.