Honestly, I’d place urban trash bins where people already pause and where the walking path stays clear. The best spots are near transit stops, crosswalks and curb ramps, building entrances, plazas, parks, seating areas, and food or drink clusters. Put each bin just off the main walking line, not in the middle of the sidewalk, so wheelchair users, parents with strollers, and older pedestrians can pass easily. Keep the opening at a comfortable height and reach, and leave clear space around it.
A simple pattern works well: one bin at each busy intersection or transit stop, one near each entrance, and extra bins where litter is consistently high. Make them visible from a distance, well lit, and easy to find, but avoid blocking tactile paving, bus shelters, benches, or crossings. In residential edges, place bins at transition points rather than right outside bedroom windows. If possible, pair bins with recycling and add lids or screens to control odor. Test the placement for a few weeks, watch where litter builds up, and adjust. Accessibility is as much about real behavior as it is about maps.