Viper's-bugloss on the Rainford bypass

On my way home from Rainford just after lunch I noticed Viper's-bugloss growing along the kerb of the Rainford bypass, on the south bound carriageway mainly between Mossborough roundabout and Pasture lane, though there were also a couple of small clumps just beyond the lane. This is most commonly found on the coast as you can see from the distribution map and prefers sand/chalk grasslands, the complete opposite basically of the Rainford mosslands. 

This is the only place I have seen it growing in St Helens though the other distribution map does have some dots in the borough. Interestingly another coastal plant, Danish scurvygrass which flowers in Mar/Apr, also grows along the bypass and the East Lancs, and it's thought that the scurvygrass grows here because of salt put down on the road during the winter. Perhaps viper's-bugloss is here for similar reasons, especially since like the scurvygrass, the bugloss is very much on the edge of the road and doesn't even seem to occur on the other side of the cycle track.