Talking of ATN, I discovered this recently, iconic Melbourne traffic reporter Caroline Ferguson celebrated 25 years with the company late last year, congrats:

However, she has since very recently departed and is now working for VicRoads’ in-house team, a few weeks back popping up on her old staple station and the same tiemslot 3AW during the afternoons (but Wednesday - Sunday now I think), having stopped appearing after many years in 2020 when Nine Radio parted ways with ATN. So a strange turn of events, but a romantic one for Ferg and long-time listeners 
It also marks the end of ATN’s original team, with her the last to finally leave, they only have a few reporters left in Melbourne now. Some other long-servers Vanessa O’Hanlon (went to ABC then Nine), Andrea McNamara (now at Go Traffic), Mike Carroll (unknown), Jimmy Wirtanen (now at VicRoads), Brad Arnoldt (now at VicRoads - does 3AW in AM used to do ABC’s in AM at ATN), Andrew Crook (now at VicRoads), Jeff Cooper (retired), Kathy Koutzas (FM radio elsewhere in Australia), Dean Pickering (focusing on his Victoria Police duties - also formerly Channel 7 Highway Patrol and FM radio) and Emma Notarfrancesco (working for F1 and Nine via Drive .com.au) all previously progressively went.
You raise some good points. One thing I would say is though the Princes Fwy (apart from its usual AM peak gridlock from Hoppers Crossing in and accidents or major road construction) rarely suffers from other congestion or incicents like most of Melbourne’s other freeways.
And beyond its urban limits, for 15-20+ years now has been minimum 3 lanes in each direction, with emergency lanes on both sides in each carriageway, with a wide centre median and wide left-hand grass/embankments, including plenty of barriers, line markings/features and monitoring equipment, which has all only expanded and got better as decades have gone on.
So many other major capital city - next largest town arterial links across Australia could only dream of being engineered/constructed like this and to this day some in parts still only have two lanes both ways, some in parts only 1, with no centre median, barriers, safety features or traffic monitoring, especially remote locations.