Hourly Volumes 2016

Tabular data containing 2016 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.本数据集为表格数据，包含哥伦比亚特区、马里兰州及弗吉尼亚州境内连续式与程控式交通计数站点（count stations）的2016年小时交通流量计数（hourly traffic counts）数据，此类数据由各州交通部（DOT）提供给TPB。小时交通流量计数数据已完成处理，按通行方向分列，并匹配至对应的定向路网路段（directional network link）。各州均提供独立的交通量统计表（traffic volume tables），文件格式为CSV。该表格数据可通过StationID字段与计数站点点图层（Count Stations layer）关联。数据中还包含ABPair字段，该字段指代与计数站点关联的路网路段（network link），可用于路网建模流程。最新的路网路段图层（network link layer）可在此处获取。请注意：路网路段图层按年份区分，历史小时交通量表中的ABPair字段值可能与当前路网路段数据集中的ABPair字段值不匹配。当一个计数站点关联多个路网路段时，交通量表将为每小时的每个路段生成一条记录。此种情况常见于两类场景：一是使用邻近站点对屏幕线路段（screenline links）开展交通计数，二是当一组高载客率车辆（HOV，High Occupancy Vehicle）路段关联多组低载客率车辆（LOV，Low Occupancy Vehicle）路段的区域。请注意该细节，切勿对交通量表中的计数数据直接求和，否则将导致重复计数（double counting）。