Core Viewpoint - The construction of the Shitai Expressway expansion project in Hebei is focused on green and low-carbon principles, utilizing recycled materials and innovative technologies to enhance sustainability in road construction [1][3]. Group 1: Project Overview - The Shitai Expressway is being expanded from 4 lanes to 6 lanes, with some sections featuring 8 lanes, and the design speed is increased from 60 km/h to between 80 km/h and 100 km/h [3]. - The project is significant as it is the first "carbon-neutral" expressway in Hebei and the first full-line expansion of a mountainous expressway in the province [3]. Group 2: Environmental Initiatives - The project incorporates rubber asphalt made from recycled tires, with a maximum blend of 50%, which enhances road durability, reduces noise, and promotes waste recycling [1][3]. - Green vegetation bags are added to the slope protection works to support ecological restoration [3]. Group 3: Investment and Infrastructure Development - Since the beginning of the 14th Five-Year Plan, Hebei has invested 165.8 billion yuan in highway construction, with plans to complete an additional 312 kilometers of highways by 2025, bringing the total to over 9,000 kilometers [4]. - The project aligns with the national strategy to build a comprehensive transportation network, enhancing connectivity with major highways and neighboring provinces [4].

Core Viewpoint - The Shitai Expressway expansion project in Hebei is China's first "carbon-neutral" highway, integrating green and low-carbon principles throughout its design and construction process [1][2]. Group 1: Project Overview - The Shitai Expressway is a crucial east-west energy transportation corridor in China, with its expansion project starting in 2022 to accommodate increasing vehicle traffic [2]. - The project involves widening the highway from 4 lanes to 6 lanes (with some sections having 8 lanes) and increasing the design speed from 60 km/h to between 80 km/h and 100 km/h [2]. Group 2: Environmental Initiatives - The project utilizes rubber asphalt made from recycled tires, with a maximum incorporation rate of 50%, enhancing road durability and reducing noise while promoting recycling and carbon reduction [1]. - Green vegetation bags have been added to slope engineering for ecological restoration and protection [1]. Group 3: Investment and Future Plans - As of the first quarter of 2025, Hebei Province plans to invest 165.8 billion yuan in highway construction, aiming to complete 312 kilometers of new highways and exceed a total of 9,000 kilometers [2]. - The project aligns with the broader goal of achieving zero carbon emissions during operation by installing solar energy facilities in service areas and along the roadbed slopes [2].