I wondered are they the same as the ones we have? Ours are sort of pale pink and white, single flowers. They often grow in hedgerows in the wild but I noticed the ones along the motorway were on free standing bushes.
It also made me think of this song, which has been stuck in my head ever since.. It's a kinda sad song but I love it because it reminds me of the old ballads/folk songs my mum used to sing to me..it's of that kind of vibe.