Altamont Corridor Express, or ACE, is used by thousands every day and climbs over Altamont Pass, between the Central and Tri Valleys. ACE travels through some of the fastest-growing cities in California, with dozens of bus connections timed to the arrivals and departures of ACE trains. These include routes straight to BART, Lawrence/Sandia Livermore Laboratories and Stanford University. ACE provides a terrific opportunity for commuters to bypass traffic on I-580, and with planned extensions to Modesto and Merced on the table, even more commuters will be able to ride the Altamont Corridor Express in the future.