Ayuntamiento de Jerez's "Autobuses Urbanos"
Bus system office on Corredera (on back side of main mercado; near Plaza del Arenal).
Office hours MTWRF 0800-1445, MTWR 1630-2030, Sat 0830-1430; long lines before noon.
Route map may be available only from bus system office,
but they usually don't have any. It's very hard to print from
Can buy a bus card at that office; no ID required; two people can ride at same time on one card.
Can recharge the card at that office, or at a couple of dozen papelerias and estancos around town.