Hourly Volumes 2012

Tabular data containing 2012 hourly traffic counts from continuous and program count stations in the District of Columbia, Maryland, and Virginia that are provided to TPB by the respective state DOTs. The hourly counts are processed, listed by direction, and also matched to the appropriate directional network link. Separate traffic volume tables are provided for each state. The tables are in CSV format. This tabular data can be joined to the Count Stations layer (point) by the StationID field. The data also contains the field ABPair that refers to the network link which is associated with the count station in order to be used in the network modeling process. The latest network link layer can be found here. Note that network layers are year-specific; ABPair on historical hourly volume tables may not match the ABPair on the current network link dataset. In cases where a count station is associated with more than one network link, the volume tables will contain one record for each link for each hour. This situation occurs where nearby stations are used for counts on screenline links and also in areas where one set of high occupancy vehicle (HOV) links is associated with multiple sets of low occupancy vehicle (LOV) links. This is important to note, so that counts in the volume tables are not summed which would result in double counting.本表格数据集收录了2012年美国华盛顿哥伦比亚特区、马里兰州及弗吉尼亚州境内连续式与规划式交通计数站点的小时交通流量数据，相关数据由各州交通运输部（Department of Transportation, DOT）提供至TPB。该小时流量数据已完成标准化预处理，按通行方向分类罗列，并匹配至对应的定向网络路段。各州均提供独立的交通流量数据表，文件格式为逗号分隔值（Comma-Separated Values, CSV）。本表格数据集可通过站点ID（StationID）字段与点型交通计数站点图层完成关联匹配。数据集同时包含ABPair字段，该字段对应与计数站点绑定的网络路段，可用于网络建模流程。最新的网络路段图层可在此处获取。请注意，网络图层按年份区分，历史小时流量数据表中的ABPair字段值可能与当前网络路段数据集的ABPair字段值不匹配。当单个计数站点关联多个网络路段时，流量数据表将为每小时的每个路段生成一条记录。该场景常见于两类情况：一是利用邻近站点对屏幕线路段开展流量计数，二是当一组高占用率车辆（High Occupancy Vehicle, HOV）路段关联多组低占用率车辆（Low Occupancy Vehicle, LOV）路段的区域。此细节需特别留意，切勿直接对流量数据表中的计数结果进行求和，否则将导致重复统计。