Rush Hour ~ No Way, it's terrible around most of Cardiff from 15:30 onwards.
I thought you might be heading out for later sessions due to wanting the street lights yet it's still dark by 17:30 isn't it, I would guess it would be a year round route for training options as well.
The traffic at the bottom of leckwith wouldn't be good during rush hour, later in the day would be fine I would have thought ~ Straight over the top and cut across cardiff bay for a scenic route.
Good luck Newport way, it's full of nutters over there
