This data represents the San Francisco Bay Trail. During the BTGCIP project, significant updates were made to segmentation and alignments, resulting in updated data. The alignments represented here correspond to the ‘aggregated’ BTGCIP data product where subsegments were used to produce more accurate cost estimates. These data are updated periodically by Alta or MTC staff to update attributes, segments status or alignment according to the Bay Trail Data Governance memo and accompanying data dictionary.