More pedestrian injuries occur at crosswalks marked by both striping on the roadway and flashing lights than occur at crosswalks not so marked. Obviously these so-called safety features are a waste of taxpayer money. The reasoning in the argument is most vulnerable to criticism because the argument ['takes for granted that crosswalks with both striping and flashing lights have no other safety features', 'fails to consider that crosswalks marked by both striping and flashing lights are marked in this way precisely because they are the most dangerous ones', 'presumes that there are less expensive features that will reduce the number of pedestrian injuries just as effectively as striping and flashing lights', 'takes for granted that safety features that fail to reduce the number of injuries are a waste of taxpayer money']