The Dutch Bicycle Design Guide 2016 (CROW) states that bollards kill. A high proportion of elderly and disabled people cycle in the Netherlands and a common often serious incident is crashing into bollards, in twilight dark or wet, both in paths and at the side of paths. It seems these incidents were not bing recorded properly in hospitals and clinics, so following the Eisenhower dictum, the uninspected inevitably deteriorates.
Kerbs are a type of barrier. They are a reactive invention.A detailed study of all types of kerbs, their history and their implications for inclusion is urgently required. Carmen Hass-Klau7 has written extensively about this, but from a pedestrian and woonerven perspective, not inclusive.
Kerbs should only be used only where clearly and explicitly argued for and where there is an explicitly agreed purpose.
Probably first introduced in Berkeley California in the late 60’s following protests by severely disabled students using the then heart lung machines who could not get around town because of ordinary kerbs acting as barriers.
They are a reactive design feature.
Changes of level and slopes with extremely common maintenance and design issues, for example position not being on desire line makes dropped kerbs severe hazards and dangerous.
Dropped kerbs should be abolished for pedestrian and cycling movements
P94 Crow states:
“Bumping into kerbs or armadillos (cycle lane delineators) and falling into verges must be prevented. Hitting kerbs and wheel stops is dangerous and it would be best to leave these out of the design.