What should be the design consideration for curbs where vehicles are allowed to park?

In the context of curbs designed for areas where vehicles are allowed to park, mountable curbs are typically the most appropriate choice. These curbs are designed to be driven over by vehicles, making them suitable for situations where parking is permitted along the edge of the roadway or in parking areas.

Mountable curbs provide a transition between the roadway and adjacent land, allowing vehicles to navigate onto and off the sidewalk or paved area without damaging the curb or the vehicle itself. Their design encourages drivers to park close to the curb without the risk of them damaging their vehicles, while still maintaining a defined edge between the roadway and the pedestrian area.

The other types of curbs serve different purposes. Barrier curbs are designed to prevent vehicles from crossing into pedestrian areas, thereby enhancing safety by protecting sidewalks or bike lanes but are not ideal where parking is expected. Drop curbs are designed to allow easy access for pedestrians, especially those with mobility challenges, and are typically found at building entrances or intersections rather than in areas designated for parking.

Given this context, the focus on mountable curbs highlights their practicality and functionality in environments that accommodate parked vehicles, making them the most suitable choice among the alternatives provided.