<prompt> Translate the following text to EnglishKazi ya chanjo iliyoonyeshwa katika mchoro wa 1 huonyesha mabadiliko katika asilimia ya vituo vinavyowezekana vinavyofikia njia kama matokeo ya mabadiliko ya kiasi.  <response>: The coverage function shown in Figure 1 models the change in the percentage of possible stops that are accessed on a route as a result of changes in volume. 