Councils and Keys just reminded me of something. Councils have roadside reserves and parks nowadays with bollards to prevent hoons from driving on them or parking in them. However they need to be mowed, trees lopped and services need access when working on sewers, water pipes, phones lines and access for police for setting up speed cameras etc. There's usually a gate with a padlock to allow access for these purposes.
I once had a job in late 1990's that involved one of these activities, and now remember being told that one of the keys issued to me for the job was a master key that worked on all these council gates. It also opened the carpark at the then workplace. I only ever used it to access McCallum Park in South Perth to do some traffic compliance surveillance on the Canning Highway off ramp. The key worked as described. I'm now wondering if all council and state government gates, such as Karrakatta Cemetery used the same locks, maybe even Telstra depots and exchanges. I always wondered how Police, SES and fire brigade vehicles gained access to the tracks at Perth Airport and Kings Park for emergency exercises or fires, so maybe everyone used the same lock?
Note. These so called council master keys probably wouldn't open buildings, just access gates.
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