"Wait, where's the exit," or, "Wait, where's the drop-off zone?" Are common questions for BART's riders, and it's certainly not their faults. BART has historically had awful signs that don't clearly point to the daily rider where to go.
However, this is changing, finally, in the next couple of years. It's already begun in several places, where BART has been installing new entrances, signs and information displays (below) around the system.
BART has also gotten to work installing real-time departure screens at entrances to stations - a hugely popular phenomenon.
The BART Board of Directors approved a contract on January 28th to jump start the third phase of wayfinding projects at Lake Merritt, Coliseum, San Leandro, Bay Fair, Hayward, South Hayward, 19th Street/Oakland, West Oakland, 16th Street/Mission, and 24th Street/Mission stations.
Construction is expected to begin in May 2016, and should conclude by the end of 2017. Finally, after 45 years, BART is actually receiving the proper signage it deserves.