WSDOT - Active Transportation Level of Traffic Stress (LTS)

WSDOT evaluated and assigned a Level of Traffic Stress (LTS) ranking to WA state highway segments to aid in efforts to analyze high-level systemic safety and user acceptance of state highways for active transportation users. This data was also intended to inform high-level prioritization of active transportation improvements. LTS data rank highway segments from 1 to 4 based on roadway characteristics like posted speed, vehicle volume, number of travel lanes, and presence of active transportation infrastructure like sidewalks and bike lanes. WSDOT deemed LTS 1 suitable for all ages and abilities. LTS 2 is considered suitable for most active travelers. LTS 3 and 4 represent functional gaps in active transportation networks that present systemic safety issues and likely deter use of active modes. The data reports a Pedestrian Level of Traffic Stress (PLTS) and Bicycle Level of Traffic Stress (BLTS) based on the presence of mode-specific infrastructure and calculated using guidance from the WSDOT Design Manual, updated September 2024. PLTS is calculated using Exhibits 1520-1 and 1520-2 based on the presence of sidewalks recorded in WSDOT enterprise sidewalk data and presence and width of a paved shoulder recorded in the State Highway Log Roadway Data Shoulders dataset. BLTS is calculated using Exhibits 1520-5, 1520-6, and 1520-7 based on the presence and width of bike lanes recorded in the State Highway Log Special Use Lanes dataset. Data is not currently available on presence of separation materials, so bike lanes were only considered based on their width. The General LTS measure is based on Exhibit 1520-5. Ramp segments are included in the dataset with a default LTS ranking of 999. This ranking indicates that all ramps are to be considered high LTS (3 or 4) unless a manual evaluation of the roadway characteristics indicates otherwise. Datasets were not available that would enable ramp rankings to be determined systematically based on posted speed, traffic volume, and number of travel lanes, however a manual review of many ramp configurations across the state indicated that most ramps present LTS concerns. The data provided is not a substitute for detailed investigation of a location when specific investment decisions are being considered. The specific characteristics of locations with the same LTS rankings could vary considerably. It is important to note that an LTS 1 or 2 location might have additional, unmeasured characteristics that reduce its presumed suitability for active travel. For additional information regarding ranking methodology or other questions about WSDOT’s Level of Traffic Stress dataset, contact Grace Young ([e-mail]).WSDOT对华盛顿州（WA）高速公路路段开展评估并赋予交通压力等级（Level of Traffic Stress, LTS）排名，旨在助力系统性交通安全高层分析，以及慢行交通（active transportation）使用者对州际公路的接受度调研。本数据集同时可为慢行交通改善项目的高层优先级排序提供决策依据。 LTS等级将高速公路路段划分为1至4级，划分依据包括路段设计特征：法定限速、机动车流量、行车道数量，以及慢行交通基础设施配置（如人行道、自行车道）。WSDOT认定LTS 1级适配全年龄段及所有能力水平的慢行出行者；LTS 2级适用于绝大多数慢行出行者；LTS 3与4级则代表慢行交通网络中的功能短板，存在系统性交通安全隐患，且大概率会抑制慢行出行的使用意愿。 本数据集包含行人交通压力等级（Pedestrian Level of Traffic Stress, PLTS）与自行车交通压力等级（Bicycle Level of Traffic Stress, BLTS），二者均基于对应出行方式的专属基础设施配置情况，并依据2024年9月更新的《WSDOT设计手册》中的指南计算得出。其中，PLTS的测算依托图表1520-1与1520-2，依据WSDOT企业级人行道数据库记录的人行道配置情况，以及《州公路日志道路数据-路肩数据集》记录的铺装路肩存在状态与宽度进行；BLTS的测算则依托图表1520-5、1520-6与1520-7，依据《州公路日志专用车道数据集》记录的自行车道存在状态与宽度进行。 目前暂无分隔设施配置的相关数据，因此自行车道的评估仅以其宽度作为依据。通用LTS等级的测算依托图表1520-5。本数据集包含匝道路段，其默认LTS排名为999：该排名表明，所有匝道默认被划归为高交通压力等级（3或4级），除非通过人工评估路段设计特征后得出不同结论。 目前暂无可依托法定限速、机动车流量与行车道数量对匝道等级开展系统性测算的数据集，但通过对全州大量匝道配置的人工审查发现，绝大多数匝道均存在交通压力等级相关的安全隐患。 需特别说明的是，本数据集无法替代特定投资决策场景下对具体路段的详细勘察；即便LTS等级相同，不同路段的具体设计特征仍可能存在显著差异。此外，LTS 1或2级路段可能存在未被纳入评估的其他特征，从而降低其原本适配慢行出行的程度。 若需了解更多等级划分方法的相关信息，或对WSDOT交通压力等级数据集有其他疑问，请联系Grace Young（邮箱：[e-mail]）。