Hourly Volumes 2008

Tabular data containing 2008 hourly traffic counts from continuous and program count stations in 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.本表格数据集包含2008年马里兰州与弗吉尼亚州的连续交通量观测站及专项交通量观测站的小时交通流量数据，该数据由两州的州交通运输部（Department of Transportation，DOT）提交至TPB。 已处理后的小时流量数据按通行方向分列，并与对应的定向网络链路完成匹配。两州均提供独立的交通流量表格，所有表格均采用CSV格式。 本表格数据集可通过StationID字段与计数站点图层（点要素类）进行关联。数据集同时包含ABPair字段，该字段指向与计数站点关联的网络链路，可用于网络建模流程。最新的网络链路图层可在此处获取。 请注意：网络图层按年份区分，历史小时流量表格中的ABPair字段值可能与当前网络链路数据集的ABPair字段值无法匹配。 若单个计数站点关联多条网络链路，则流量表格将为每小时的每条链路生成一条独立记录。该情况常见于两类场景：一是利用邻近站点对屏幕线链路开展交通计数，二是当一组高载客率车辆（High Occupancy Vehicle，HOV）链路与多组低载客率车辆（Low Occupancy Vehicle，LOV）链路关联时。 此细节需重点关注，切勿对流量表格中的计数数据直接求和，否则将导致重复计数。