Sand Box John wrote:"lensovet"
which is why what you do is (still under the 3-hour limit) exit one station beyond the one from which you entered (or just some other station) and then re-enter. it's also a lot cheaper that way – i dunno who came up with the whole "excursion fare" idea in the first place.
The who is really irrelevant. The why the excursion fare exists is what is important. The purpose of the excursion fare is to induce use of the system by tourists and visitors to attractions in the bay area.
Washington’s metrorail has a similar excursion fare, WMATA's excursion fare is $6.50 and is good for unlimited rides after 9:30 AM weekdays and all day on weekends, holidays and selected Monday holidays.
All of WMATA metrorail farecards have time limit that will flag you at the exit gate if you exceed that limit. I think it's in the range of 3 hours.
note that the excursion fare is NOT a day pass. it simply dictates the following: when you exit in the same station as you entered, you'll get charged $4.65 (or whatever the fare is). the only "excursion" you'll have is an excursion of the BART system, since once you exit at a different station, the excursion "fare" doesn't apply.
so this has nothing to do with tourism, unless you're talking about tourists simply checking out bart...in which case we call it railfanning
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