What does this marking mean?

Normally do not park within 500 mm of its centre. The exception requires the driver to remain, or a licensed person able to move the vehicle; any passenger alone is insufficient.

Ko e angamaheni, ʻoua ʻe tau ʻi loto ʻi ha milimita ʻe 500 mei hono loto. Ko e faka'atā makehe ʻoku fiema'u ke nofo ai e tokotaha faka'uli, pe ha tokotaha ʻoku ʻi ai ʻene laiseni pea lava ʻo hiki e me'alele; ʻoku ʻikai fe'unga ha pasese pē.