Wearing a hoodie that said "DEAF" on the back in capitals

Did a really shit job at spraying ¨deaf´on the back of the bag thought, needless to says it still work as well as the sellotapes one that I use for testing.

vehicle gave me a lots less grief now that they notice my bags, especially giving me space without driving too close to me.

You could get some electroluminescent wire and shape it into the words DEAF and tack or sew it over the letters - you can even make it flash pretty easily.