Was driving to Waikanae yesterday and there was a policr car just south of QEII Park. They were within 200 metres of a speed change sign which is actually against their own regulations.
Being a friendly sort I did the customary warning to oncoming traffic by flashing my headlights. Many waves and smiles back. Then noticed one car was flashing their lights back also. How friendly I thought. Until I noticed it was a police car and they looked fairly unhappy at my good samaritan activities.