Hourly Volumes 2011

Tabular data containing 2011 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.该表格数据涵盖2011年哥伦比亚特区、马里兰州及弗吉尼亚州的连续式计数站与项目式计数站的小时交通流量统计结果，相关数据由各州交通部（Department of Transportation, DOT）提交给TPB。经处理后的小时流量数据按通行方向分列，并与对应的定向路网路段（network link）完成匹配。各州均提供独立的交通流量统计表，文件格式为CSV。可通过StationID字段将该表格数据与计数站（Count Stations）点图层进行关联。数据中还包含ABPair字段，该字段指向与计数站关联的路网路段，可用于路网建模流程。最新的路网路段图层可在此处获取。请注意，路网图层按年份区分，历史小时流量统计表中的ABPair字段值可能与当前路网路段数据集的ABPair字段值不匹配。当一个计数站关联多个路网路段时，流量统计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：一是使用邻近站点对屏幕线（screenline）路段进行流量统计，二是当一条高载客率车辆（high occupancy vehicle, HOV）路段关联多条低载客率车辆（low occupancy vehicle, LOV）路段的区域。请注意此细节，切勿对流量统计表中的数值直接求和，以免造成重复计数。