As the host of the Discovery Channel's Cash Cab and Cash Cab: After Dark (trivia shows that actually play out in a cab), comedian Ben Bailey knows public transportation. So it's not too surprising that that his stand-up routines, which have amused the audiences of the Tonight Show With Jay Leno and the Late Late Show With Craig Kilborn, often involve buses and drivers. We suspect those two topics might fuel his Denver show this week. After all, RTD and FasTracks are easy fodder for this down-to-earth comedian. Thu-Sat, Mar. 26-28. Thu 8 p.m.; Fri 8 p.m., 10 p.m.; Sat 6:30 p.m., 8:30 p.m., 10:30 p.m. Comedy Works Larimer Square; 1226 15th St.; 303-595-3637; $17, $25