Hourly Volumes 2020

Tabular data containing 2020 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.本数据集包含哥伦比亚特区、马里兰州及弗吉尼亚州境内连续式计数站与程控计数站的2020年小时交通流量数据，相关数据由各州交通部（Department of Transportation, DOT）提供给TPB。该小时流量数据已完成预处理，按行车方向分列，并与对应的定向路网路段完成匹配。各州均提供独立的交通流量数据表，数据格式为逗号分隔值（Comma-Separated Values, CSV）。此类表格数据可通过StationID字段与计数站图层（点要素类）进行关联。数据中还包含ABPair字段，该字段指向与计数站绑定的路网路段，可用于路网建模流程。最新的路网图层可在此处获取。需注意，路网图层具有年份特异性；历史小时流量表中的ABPair字段值可能无法与当前路网数据集的ABPair字段值匹配。若某计数站关联多条路网路段，则流量数据表中每小时将为每条路段生成一条记录。此类场景常见于：使用邻近站点统计屏线路段流量的场景，以及高占用车辆（High Occupancy Vehicle, HOV）路段关联多条低占用车辆（Low Occupancy Vehicle, LOV）路段的区域。请注意此细节，切勿对流量数据表中的计数直接求和，否则将导致重复统计。