[mkgmap-dev] why do we have mkgmap:road-speed-class ?

Hi WanMil, I fear I don't understand the meaning of this new tag. Docu says: "A value between 0 and 7. Overrides the road_speed definition in the element type definition if this tag is set." We have mkgmap:road-speed which allows to increment, decrement or override the road speed value in the element type definition. Why did you introduce this new tag? Gerd