Regardless if every 'street' is marked in your area or if you insist that "children living in [an] oil producing area should know NOT to climb ..." does not remove the responsibility of the oil company to have in place certain minimum safegards to restrict unauthorized access by persons ...
We here in America who own property generally have certains 'minimum' to meet in order to 'safe' property - industry (oil, manufacturing, etc) have addititional measures to take and requiremets to meet in order to protect 'idiots', children and 'the public' who might wander onto their property.