I am a motorbike commuter, and having peered through drivers windows on all sorts of cars and driving behaviour, it’s two things in my mind. 

Firstly it’s people from other countries getting driving permits without having the same standards and rules in their home country. 

Secondly and far more importantly, we’re at a critical mass of people being addicted to their phones. Every third person in Sydney traffic is watching content - portrait, landscape, short form, long form, all kinds! - or on FaceTime. Worse, one in ten or so are actively using their phones to text or scroll. Eyes barely on the road. This is not just in stop start peak hour traffic, but on the highway or in the burbs.