Our mates, Melbourne's public transport Authorised Officers, work bloody hard. Running around town gangbashing teenagers over $4 may look like a piece of piss, but the hidden psychological toll is heavy. To make their miserable lives easier, PTV should install audio cues to help commuters  distinguish whether they are in the magical Free Tram Zone, or the dark and oppressive realm of the Not Free Tram Zone.

Since myki cannot be enforced legally for doesn't-work-properly reasons, Authorised Officers are the thin beige line between public transport providers and fare evasion armageddon comparable to the $1.5 billion that was flushed down the toilet on myki itself. Anything that can assist their heroic efforts to intimidate vulnerable-looking fare evaders into coughing up has got to be a good thing.