No, that's a raised kerb. No painted line could reach 10cm in height (I'm sure there's a Guinness World Record attempt waiting), and no engineer in their right mind would ever design one. It should definitely read '10mm'.
I managed that on cobblestones the other week in a pedestrianised area, my front wheel chattered along the side of them, all laid in a long row! I didn't see that one coming. Not your Victorian levels of workmanship.
No, that's a raised kerb. No painted line could reach 10cm in height (I'm sure there's a Guinness World Record attempt waiting), and no engineer in their right mind would ever design one. It should definitely read '10mm'.