Kassel kerb
A Kassel kerb is a design of kerb (curb in US English) that features a concave-section that allows for an easier alignment for buses. The kerb was first introduced in the German city of Kassel for the low-floor tram system but has since been adopted for use at traffic stops. Kassel kerbs can be part of a bus stop kerb, designed for low-floor buses that serve an elevated bus stop platform.