When the sidewalks were re-done on Pond Street, really nice ADA crosswalk ramps were added, but many of the crosswalks were never painted (photo above is Chesterford Street with only a stop line, no painted crosswalk).
The new crosswalk accross Pond Street to the Horn Pond recreation area is faded and needs re-painting. Other towns use a textured paint that is raised and reflective (see Woburn's crosswalk just down the road). Seems like this would stand up to the wear and tear of snow and ice. A raised crosswalk would too, of course.