Not saying PPE makes you bullet proof , just helps divert or possibly protect and or reduce any injury ,
I am now in the Construction Industry , I am not sure how PPE could circumvent safe practise and procedure other than not wearing it ,
In London , Hi Viz and Helmets could never be mandatory as long as there are Boris Bikes on the road , but if you have never seen a Boris bike , they are lit up ,
as an individual I choose to don articles / items on myself and bike that in my opinion alert others to my presence , therefore decreasing possible risk factors ,
I also wear items to protect me from the elements in winter and summer , mainly for comfort , severe discomfort could lead to distraction , which in turn could lead to a problem ,
Vehicle drivers should only depend on themselves and roadworthy-ness of their vehicles whilst driving to avert collisions with any others regardless,