A town tested a weekend shuttle to help residents reach a riverside market. Passenger numbers rose during the six-week trial, but the transport office did not treat the increase as proof that the shuttle alone had attracted more visitors. The market had added evening performances, and unusually mild weather had encouraged people to stay outdoors. To identify what the shuttle contributed, the office compared three kinds of evidence. First, it asked passengers how they had traveled before the trial. Second, it checked whether ridership changed on weekends without performances. Third, it compared the riverside route with another market that had similar events but no new shuttle. The shuttle appeared most useful to older residents and families carrying large bags. However, the comparison market also gained visitors, suggesting that weather and performances mattered. The office kept the route for another trial but reduced its claim: the shuttle improved access for some groups, while the total rise in market attendance had several causes. It also planned to test the route in colder weather before deciding whether to make the service permanent.