In 2016, travel time reliability on Bay Area highways shifted slightly, with the morning peak period becoming a bit more reliable while the evening peak period became less so. This is due in part to rising congestion, especially in the evening peak, which results in less consistent travel times. Despite these diverging trends, however, travel time reliability as measured by buffer time index has remained similar since 2010. During peak periods over the past half-decade, a driver with a 30-minute typical commute would need to leave approximately 11 minutes early to be confident of an on-time arrival. Reliability has remained largely stable even as traffic congestion has increased (up 60 percent since 2000, as measured by congested delay per commuter). In many parts of the region, heavily traveled corridors continue to be “reliably congested,” providing consistent travel times even in near-gridlock conditions.