The short answer is: they can, but not every street bench does. To know whether these specific street benches meet ADA public accessibility guidelines, you need to check both the bench dimensions and how the bench is installed.
Under the 2010 ADA Standards for Accessible Design, benches that are intended to be accessible should follow Section 903. The key numbers are simple. The seat height should be 17 to 19 inches above the ground. The seat depth should be at least 20 inches and no more than 24 inches. The bench should be at least 42 inches long, which gives enough room for someone to sit securely or transfer from a wheelchair. There also needs to be clear floor or ground space at one end of the bench, positioned parallel to the short side, so a wheelchair user can pull alongside instead of having to approach from the front.
A backrest is not always required for every bench, but if the bench has one, it should provide real back support. Under the ADA bench standards, a backrest should extend at least 18 inches above the seat and be at least 42 inches long. If the bench is placed against a wall, that can sometimes serve as the back support.
Placement matters just as much as the bench itself. The bench should be located on an accessible route with a firm, stable, slip-resistant surface. It should not be stranded in a grass strip, gravel bed, or uneven area where a wheelchair or walker cannot reach it. The clear space beside the bench should not block the main pedestrian path or create a tripping hazard.
So if these street benches have a seat height around 17 to 19 inches, a seat that is 20 to 24 inches deep and at least 42 inches long, clear wheelchair space at one end, and they sit on a firm, accessible route, then they generally meet the core ADA accessibility guidelines. If they are too low, too deep, have no clear approach space, or are placed on an unstable surface, then no — they likely would not be considered ADA-compliant for public accessibility. Keep in mind that local codes or PROWAG may be stricter, so ADA compliance is the baseline.