High speed overtaking idiots.

I shared the driving from Sydney to Dubbo and back over the last three
days.

Some notable efforts from other drivers included

a) Overtaking at 100+km/h on the other side of double white line and 
chevron marked roadway.

b) Following me about a car length behind when I'm overtaking someone 
else, again at 100+km/h. What if I changed my mind? I never have done 
after starting an overtake, but there's always a first time. This was P 
plater.

Do some people just not like their lives?

Sylvia.