Abstract: Tunnels, as vital components of transportation infrastructure, not only enhance traffic efficiency but also pose significant challenges in terms of frequent traffic accidents. This study delves into the peculiarities of the tunnel traffic environment to understand the high incidence of accidents, particularly in the context of high-speed rear-end collisions. Addressing the limitations of Doppler radar speedometers in tunnels, we introduce a speed measurement system based on dual infrared laser technology, specifically designed to overcome the difficulties of speed measurement in such environments. This system, featuring a dual infrared laser setup, has demonstrated excellent performance on open roads and superior capabilities within tunnel settings. Field tests and comparisons with conventional speed measurement methods have validated the effectiveness of the dual infrared laser speedometer in tunnels. However, enhancements in monitoring efficiency, particularly under high traffic conditions, are still necessary. Overall, this research presents a novel technological approach to tunnel traffic monitoring, offering significant innovations for improving traffic safety and efficiency. Future efforts should aim at further increasing monitoring efficiency to accommodate more complex and dense traffic scenarios, thereby advancing the comprehensive progress of tunnel traffic management systems.