San Diego Region SB743 VMT Maps

The California Senate Bill 743 (SB 743) (Steinberg, 2013) VMT maps provide an estimate of personal vehicle travel by residents and employees within the San Diego region. The California Office of Planning and Research released a Technical Advisory on Evaluating Transportation Impacts in CEQA (https://opr.ca.gov/ceqa/sb-743/) and the maps provided by SANDAG are an interpretation of the guidelines provided as a resource to the jurisdictions in our region to use as they see fit. The estimated data in these maps are an analysis of travel using SANDAG’s ABM. The currently approved ABM version (14.2.2) used for the 2021 Regional Plan is ABM2+ with the Series 14 Growth Forecast version 38. The historic version of the ABM (14.1.1) was used for the 2019 Regional Transportation Plan with the Series 14 Growth Forecast version 17. These maps and data are subject to change as new estimates are produced using updated inputs and methodologies. Local jurisdictions are under no obligation to use the data in their development approval processes or transportation analyses under SB 743. Users of the data should exercise their professional judgment in reviewing, evaluating, and analyzing VMT reduction estimate results from the tool. Each agency should consult with California Environmental Quality Act (CEQA) experts and legal counsel regarding their own CEQA practices and updates to local policies. The estimated data are provided at four geographic scales: City, City/County CPA, Census Tract, and Traffic Analysis. For each geography SANDAG provides the VMT data per capita and per employee. VMT per capita represents the average amount of personal, non-commercial, vehicle travel made on an average weekday by each resident who lives within that geographic boundary. VMT per employee represents the average amount of personal, non-commercial, vehicle travel made on an average weekday by each resident employee whose employment/work location is within that geographic boundary. When downloading and viewing this layer in GIS or tabular formats, all records will be displayed by default. In order to limit the records to a specific VMT category, a query or filter on [version], [geo], [year], and [vmt_type] fields will need to be applied. For example, when using the query in GIS you can set the definition query to: [version] = "ABM2+ / 2021 RP" AND [geo] = "Census Tract" AND [year] = 2016 AND [vmt_type] = "Residents" - this query will display only records for census tracts with 2016 VMT estimates by residents. An example in Excel would consist of setting the filter (checkbox) [version] = "ABM2+ / 2021 RP", [geo] = "Census Tract", [year] = 2016, and [vmt_type] = "Residents" to display records for census tracts with 2016 VMT estimates by residents.加州参议院第743号法案（Senate Bill 743, SB 743，Steinberg, 2013）配套的车辆行驶里程（Vehicle Miles Traveled, VMT）地图集，用于估算圣迭戈地区居民与雇员的私人车辆出行情况。加州规划与研究办公室（California Office of Planning and Research）发布了《加州环境质量法案（California Environmental Quality Act, CEQA）交通影响评估技术指南》（链接：https://opr.ca.gov/ceqa/sb-743/），圣迭戈地区政府联合会（San Diego Association of Governments, SANDAG）提供的该系列地图，是对上述指南的解读成果，可供本地区各司法管辖区按需参考使用。 本地图集中的估算数据基于SANDAG的活动出行模型（Activity-Based Model, ABM）开展出行分析。当前用于2021年区域规划的经核准ABM版本为14.2.2，即ABM2+搭配系列14增长预测版本38；而2019年区域交通规划所采用的ABM历史版本为14.1.1，搭配系列14增长预测版本17。 本数据集及相关地图可能会因采用更新后的输入参数与方法论生成新估算结果而发生变更。各地方司法管辖区并无义务在其开发审批流程或SB 743要求的交通分析中使用本数据。数据使用者应结合专业判断，对本工具生成的VMT削减估算结果进行审查、评估与分析。各机构应就自身的CEQA实务及地方政策更新，咨询CEQA专家与法律顾问。 本估算数据涵盖四类地理粒度：城市、市县社区规划区（City/County CPA）、普查街区（Census Tract）以及交通分析区域（Traffic Analysis）。针对每一类地理粒度，SANDAG均提供人均VMT与单位雇员VMT数据。其中，人均VMT指居住于该地理边界内的每位居民，在一个典型工作日内的平均私人非商业车辆出行里程；单位雇员VMT指工作地点位于该地理边界内的每位在职雇员，在一个典型工作日内的平均私人非商业车辆出行里程。 当以GIS或表格格式下载并查看本图层时，系统默认将显示所有记录。若需将记录限定至特定VMT类别，则需对[version]、[geo]、[year]及[vmt_type]字段设置查询或筛选条件。例如，在GIS中使用查询时，可设置定义查询为：[version] = "ABM2+ / 2021 RP" AND [geo] = "Census Tract" AND [year] = 2016 AND [vmt_type] = "Residents"——该查询将仅显示2016年居民VMT估算值的普查街区记录。在Excel中的示例操作则为：筛选[version]为"ABM2+ / 2021 RP"、[geo]为"Census Tract"、[year]为2016且[vmt_type]为"Residents"，即可显示2016年居民VMT估算值的普查街区记录。