ADOT 2024 Through Lanes

The number of through lanes on a roadway, which are lanes pass through at least two intersections and do not taper or turn into a turn lane. This event layer also includes the average lane width for the through lanes. To learn more about through lanes, refer to the ADOT Glossary - Lanes webpage. For undivided highways, where there is no physical barrier between opposing lanes of traffic, through lanes represent the total number of lanes on both sides of the road. For example, if there are 2 through lanes on the cardinal side of the road and 2 lanes on the non-cardinal side of the road, the number of through lanes reported is 4. Note, cardinality refers to the direction of increasing mileposts. For roadways that have no striping, such as in residential neighborhoods, the number of through lanes is reported as 2. For divided highways, through lanes are reported for the individual roadway. For example, if there are 2 through lanes on the cardinal highway, the value is reported as 2. Important: Many roadways have estimated values for the number of lanes and average lane widths. These values were based on the functional system of the road and the area characteristics. Reported Extent: All roads eligible for federal aid, including ramps, and optional for other roadways. Federal aid-eligible roads include urban roads classified as minor collectors or above (functional system 1-6) and rural roads classified as major collectors or above (function system 1-5).本数据集统计道路直行车道（through lanes）的数量：直行车道指至少途经两个交叉口、未缩窄或未转换为转向车道的车道。本事件图层同时包含直行车道的平均宽度。如需了解直行车道的更多详情，请参考ADOT车道术语网页。 对于无分隔带高速公路（对向行车道之间无物理隔离设施），直行车道总数为道路两侧的车道数之和。例如，若道路里程递增方向侧设有2条直行车道，非里程递增方向侧设有2条车道，则上报的直行车道总数为4。注：里程基准（cardinality）指里程桩编号递增的方向。 对于未施划车道线的道路（如居民区道路），直行车道数量上报为2。对于有分隔带高速公路，直行车道数量按单个车道段分别上报。例如，若里程递增方向的高速公路设有2条直行车道，则上报值为2。 重要说明：多数道路的车道数量及平均车道宽度为估算值，此类估算值基于道路功能等级（functional system）及区域特征得出。 上报覆盖范围：所有符合联邦资助资格的道路（含匝道），其他道路可选择上报。符合联邦资助资格的道路包括：等级为次要集散道路及以上的城市道路（功能等级1-6），以及等级为主要集散道路及以上的农村道路（功能等级1-5）。