Shower Thoughts: How do streets get their numbers

Have you ever been standing in the shower when suddenly the noise in your brain clears and, in its place, appears the perfect thought? That's a Shower Thought, and RNZ's Nights is aiming to answer those unshakeable questions lurking at the back of your mind. Tonight's question: How do streets get their numbers? Who decides where number 1 starts? Why are the odds on one side and the evens on the other? And what happens when someone squeezes a new house between two old ones? To help us unravel it all is New Zealand's Surveyor-General, Anselm Haanen.