In reply to “Bike lane lumps can be costly” (Our Readers’ Views, Sept. 20), when I first saw the solid gray lumps along Columbia Street, I was amazed the city would install something so low and dark they cannot be seen. They are a hazard to bike riders, pedestrians and cars. They are a tripping hazard to pedestrians — I call them “ankle breakers.” If a bike rider hits one he/she will crash and probably be thrown into the street. The way they are set up so close together it is not possible to hit just one. Why would the city be so cruel and vicious to its citizens?