MDOT SHA Annual Average Daily Traffic (AADT)

Esri ArcGIS Online (AGOL) Hosted Feature Layer for accessing the MDOT SHA Annual Average Daily Traffic (AADT) data product. MDOT SHA Annual Average Daily Traffic (AADT) data consists of linear & point geometric features which represent the geographic locations & segments of roadway throughout the State of Maryland that include traffic volume information. Traffic volume information is produced from traffic counts used to calculate annual average daily traffic (AADT), annual average weekday traffic (AAWDT), AADT based on vehicle class (current year only) for roadways throughout the State. Ten (10) years of historic AADT & AAWDT traffic volume metrics are also available for each geographic location or segment of roadway throughout the State, where applicable. Annual Average Daily Traffic (AADT) data is collected from over 8700 program count stations and 84 ATRs, located throughout Maryland. The quality control feature of the system allow data edit checks and validation for data from the 91 permanent, continuous automatic traffic recorders (ATRs) and short-term traffic counts. Program count data is collected in both directions (inventory & non-inventory) at regular locations on either a three (3) year or six (6) year cycle depending on the type of roadway. Growth factors are applied to counts which were not taken during the current year and the counts are factored based on the past yearly growth of an associated ATR. Counters are placed for 48 hours on a Monday or Tuesday and are picked up that Thursday or Friday, respectively. The ATR and toll count data is collected on a continuous basis. Toll station data is provided by the Maryland Transportation Authority (MDTA). A special numeric code was added to the AADT numbers, starting in 2006, to identify the years when the count was actually taken. The last digit represents the number of years prior to the actual count. Where “0” represents the current year when data was collected (in 2020), “1” represents the count taken in 2019, “2” represents the count taken in 2018, “3” represents the count taken in 2017 and so forth. Annual Average Daily Traffic (AADT) data is a strategic resource for the Federal Highway Administration (FHWA), the Maryland Department of Transportation (MDOT), the Maryland Department of Transportation State Highway Administration (MDOT SHA), as well as many other Federal, State & local government agencies. The data is essential in the planning, design and operation of the statewide road system and the development & implementation of State highway improvement & safety programs. The MDOT SHA Traffic Monitoring System (TMS) is a product of the ISTEA Act of 1991, which required a traffic data program to effectively & efficiently meet MDOT SHA’s long-term traffic data monitoring & reporting requirements. Annual Average Daily Traffic (AADT) data is updated & published on an annual basis for the prior year. This data is for the year 2023. View the most current AADT data in the MDOT SHA Annual Average Daily Traffic (AADT) Locator For more AADT data information, contact MDOT SHA OPPE Traffic Monitoring System (TMS) Unit: Email: [e-mail] For more general information, contact MDOT SHA OIT Enterprise Information Services: Email: [e-mail] ArcGIS Online（AGOL）托管要素图层，用于访问马里兰州运输州公路管理局（Maryland Department of Transportation State Highway Administration, MDOT SHA）的年平均日交通量（Annual Average Daily Traffic, AADT）数据产品。MDOT SHA年平均日交通量（AADT）数据包含线性与点几何要素，用以表征马里兰州全境道路的地理位置与路段，并附带交通流量信息。交通流量信息源自实地交通计数数据，用于计算年平均日交通量（AADT）、年平均工作日交通量（Annual Average Weekday Traffic, AAWDT），以及基于车辆类别的年平均日交通量（仅限当前年份，适用于全州道路）。此外，在适用场景下，全州各地理位置或道路路段均可获取长达10年的历史AADT与AAWDT交通流量指标。年平均日交通量（AADT）数据采集自分布于马里兰州全境的8700余个项目计数站点与84台自动交通记录仪（Automatic Traffic Recorders, ATRs）。该系统自带的质量控制功能，可对来自91台永久连续式自动交通记录仪（ATRs）以及短期交通计数的数据开展编辑检查与有效性验证。项目计数数据在常规点位的双向路段（含库存与非库存路段）采集，采集周期根据道路类型分为3年或6年。对于非当年度获取的计数数据，将应用增长因子进行折算，折算依据为关联自动交通记录仪的过往年度交通增长情况。计数设备将在周一或周二部署，持续采集48小时，并分别于当周周四或周五收回设备。自动交通记录仪与收费站的交通计数数据采用连续采集模式。收费站数据由马里兰州运输管理局（Maryland Transportation Authority, MDTA）提供。自2006年起，AADT数值中新增了特殊数字代码，用于标识实际开展交通计数的年份。该代码的最后一位数字代表实际计数年份距当前年份的年数：“0”代表数据采集的当年（如2020年），“1”代表2019年的计数数据，“2”代表2018年的计数数据，“3”代表2017年的计数数据，依此类推。年平均日交通量（AADT）数据是美国联邦公路管理局（Federal Highway Administration, FHWA）、马里兰州运输部（Maryland Department of Transportation, MDOT）、马里兰州运输州公路管理局（MDOT SHA）以及众多其他联邦、州级与地方政府机构的战略资源。该数据在全州道路系统的规划、设计与运营，以及州级公路改善与安全项目的制定与实施中具有不可或缺的重要作用。MDOT SHA交通监测系统（Traffic Monitoring System, TMS）是1991年《综合地面运输效率法案（Intermodal Surface Transportation Efficiency Act, ISTEA）》的产物，该法案要求建立交通数据项目，以高效满足MDOT SHA的长期交通数据监测与报告需求。年平均日交通量（AADT）数据每年更新并发布上一年度的版本，本次提供的数据为2023年度数据。可通过MDOT SHA年平均日交通量（AADT）查询工具查看最新的AADT数据。如需获取更多AADT数据相关信息，请联系MDOT SHA OPPE交通监测系统（TMS）单元，电子邮箱：[e-mail]。如需获取更多通用信息，请联系MDOT SHA OIT企业信息服务部门，电子邮箱：[e-mail]