This is a typical single issue response not only does it not appreciate the whole situation but it doesn't even begin to consider what "enforcement" entails.
It is NOT just a matter of getting the police to "do their job".
It requires a total reformation of both the police and the justice system This would require major constitutional reform.
It also requires a redesigning of the road system, markings and signage etc. The establishing of a new set of road safety laws and a national sea change in public awareness.
Successive governments have chosen to ignore the advice of road safety organisations and by doing so, allowed the situation to get worse and worse. They are going down a road that is increasingly difficult to get back from.
Failing to properly identify the problem just makes it worse.