Cycling Dan
Cycle Crazy
Again by asking when its best to filter shows you missed the point unless im not making my argument clear which is possible.So when is best to filter ?? as your right im really not getting your point. Had the OP been "filtering" past 20 mph moving traffic then yes id say probably not the best idea.
I thought it was a safe time to filter. However you claimed that because the Law said you could it meaning that he should or that's what was implied as others should have expected it.