If there’s one issue that angers commuters, it is other travellers not wearing face masks.
The new law was introduced on 15 June and for the last month it has been mandatory to wear face masks on public transport.
So is it working?
The authorities say 90% of people abide by it but there is plenty of anecdotal evidence that some are still not wearing a face covering and there are many examples of people not wearing the coverings correctly.
Transport for London (TfL) says compliance is higher on the Tube and in rush hour.
The authorities had spoken about social pressure playing a part in getting people to wear a mask, in the same way the alcohol ban on transport worked.
Now though it seems TfL and British Transport Police (BTP) are ramping up their enforcement.
In the first month, BTP across the UK, asked 18,037 people to wear a covering and asked 819 to leave the network. It also issued 21, £100 fines. face masks
TfL warned 10,000 passengers and has given out 14 fines.