The article by Heather du Plessis-Allan ("Roads mess could cost election", July 14) reveals the ignorance of most newspaper columnists on most subjects.

The problem is known as "induced demand" — an expression used by economists to describe what happens when increasing the supply of something (such as roads) makes people use that thing even more. Traffic engineers have been aware of this phenomenon since at least the early 1960s when they observed a strong correlation between more roads and a subsequent rise in traffic.

Instead of attacking the Government (her primary motivation I suspect), du Plessis-Allan

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Death with dignity

A good death

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A zillion to one

Tunnel vision

Hobsonville history