This dataset contains statewide impervious surface and advanced transportation vector features for the State of Connecticut. The dataset was developed from 2023 source imagery to provide a high-resolution, consistent geospatial representation of impervious land cover and transportation-related infrastructure across the state. The impervious surface component includes mapped features such as buildings, roads, driveways, parking areas, sidewalks, pavement, swimming pools, paved recreation surfaces, and bridges. The advanced transportation component includes transportation centerline and lane-related features such as turning lanes, through lanes, bike lanes, shoulders, sidewalks, crosswalks, and related width attribution where applicable. Feature capture and attribution were performed according to defined class-specific interpretation and minimum mapping specifications. The dataset is intended to support statewide mapping, transportation analysis, infrastructure planning, land cover assessment, hydrologic and stormwater analysis, emergency management, and other GIS-based applications. Note: The impervious surface component is represented as polygon features, while the advanced transportation component is represented as polyline features.