I should be able to remove them. While roads look wide in OSM they are only stored as a line, so I'll need to do something different to that used to remove trees from water. I can get the script to look for trees within a set distance of any road and remove them. I used this sort of command successfully in the filler template I created to create houses without OSM data. I'll add it to the to do list.
Thank you Chris, that sounds very promising
Jakob