Oda always makes sure to draw the characters to be recognisable, otherwise you'd have Elbaf mountains being 3x of Loki's size at best which is extremely inaccurate.
It isn't just Road's room. Everything is gigantified in Elbaf. Simple plants, trees, rocks, etc. One of the Elbaf ships can easily contain dozens of giants and it is just some small point in this country.
Look, the Elbaf ship Zoro slightly cracked before with his CoC:
See how small it looks in comparison to the spot they are at rn, let alone the entire country.
Dragon Loki carried several giants on his back and they looked like ants in comparison. His dragon spikes look like mountains itself...