Unfortunately they also allow the cars and trucks to drive up on the side without the warning the curb provides. The slanted ones are pretty heavily used here in Atlanta. I don't know how they decide which ones to install. Lately thought, most of the new neighborhoods have the traditional ones.

Sloped kerbs (or curbs) are normally provided (in most places I have been) for short stretches at pedestrian crossings and access drives; for the benefit of pedestrians and those pushing baby pushchairs etc.

By biker do you mean bicycle or motor bike? Either way, bikes are not allowed on the pavement (sidewalk), that is for pedestrians.

The easy way to keep vehicles from parking on the pavement is with bollards, posts, large stone balls etc. I know some town centres where the the pavement is on the same level as the road (no kerb), but there is a line of metal posts which keeps the traffic off the pavement. The posts are close enough so vehicles cannot drive between them, but people can easily walk between them.

I disagree with the general idea. For the same reason stated by BKeene12 above. This completly takes away from the functionality of the curb in the first place. I think that little shelf provides immeasurable safety to pedestrians in certain situations that sloping the sides just couldnt provide.

I do like the idea because it would decrease the amount of scuffing suffered by my wheels when attempting to parallel park :)

The slanted / drive over curb is a good idea in terms of developement. The road, curb / gutter, & sidewalk can all be built at one time. As new houses are built there is no need to make curb cuts for driveways.

However, drive overs are not a good idea in areas prone to snowfall. The plow drivers have nothing to "feel" when plowing and consequently tear up a lot of lawns.

Addditionally, people parking along the street tend to drive up on the lawn. If it has recently rained the grass gets destroyed.