This paper introduces CurvS, a web-based tool for researchers and analysts that automatically extracts, visualizes, and analyzes roadway horizontal alignment information using readily available geographic information system roadway centerline data. The functionalities of CurvS are presented along with a brief background on its methodology. The validation of its estimation results are presented using actual horizontal alignment data from two different roadway types: Route 83, a two-lane two-way rural roadway in New Jersey and I-80, a freeway segment in Nevada. Different metrics are used for validation. These are identification rates of curved and tangent sections, overlap ratio of curved and tangent sections between estimated and actual horizontal alignment data, and percent fit of curve radii. The validation results show that CurvS is able to identify all the curves on these two roadways, and the estimated section lengths are significantly close to the actual alignment data, especially for the I-80 freeway segment, where 90% of curved length and 94% of tangent section length are correctly matched. Even when curves have small central angles, such as the ones in Route 83, CurvS’s estimations covers 71% of curved length and 96% of tangent section length.

本文介绍了CurvS，这是一种面向研究人员和分析人员的基于 Web 的工具，可使用现成的地理信息系统道路中心线数据自动提取、可视化和分析道路水平线形信息。CurvS的功能介绍了其方法的简要背景。使用来自两种不同道路类型的实际水平路线数据对其估计结果进行验证：83 号公路，新泽西州的一条双车道双向乡村公路和 I-80，内华达州的高速公路路段。不同的指标用于验证。这些是弯曲部分和切线部分的识别率、估计和实际水平对齐数据之间弯曲部分和切线部分的重叠率以及曲线半径的拟合百分比。验证结果表明，CurvS能够识别这两条道路上的所有曲线，并且估计的路段长度与实际路线数据非常接近，特别是对于I-80高速公路段，其中90％的曲线长度和94％的切线长度是正确的匹配。即使曲线的中心角很小，例如 83 号公路中的曲线，CurvS的估计也涵盖了 71% 的曲线长度和 96% 的切线段长度。