The term 'street borders' can be summarized by the crossword solution 'curbs, ' which is a five-letter word. Curbs are the edges of a street or sidewalk that are raised above the road surface and are typically made of concrete, metal, or stone. They are used to separate the street from the sidewalk and to provide a barrier between the two. Curbs also help to control the flow of traffic and can be used to prevent vehicles from entering certain areas.