Recently, video data from the traffic incident detection system of the Maoliling Tunnel Management Office of Zhejiang Communications Group showed that 90% of abnormal events in the tunnels under its jurisdiction were detected within one minute, the proactive detection rate of video surveillance reached over 97.27%, and the overall proactive detection rate reached 99.3%.

The Maoliling Tunnel Management Office is located in the Wu'ao junction area of the Yongtaiwen Expressway and the ShangSan Expressway, and administers 12 tunnels with a total single-tube length of 15.96 kilometers. The longest, the Maoliling Tunnel, has a single-tube length of 3.6 kilometers and an average daily traffic volume of 45,000 vehicles, with a historical peak daily volume of 95,000 vehicles; trucks account for 48%, including nearly 750 hazardous chemicals vehicles per day on average, equivalent to one hazardous chemicals vehicle passing through the Maoliling Tunnel every two minutes.

Traffic conditions in the Maoliling Tunnel

At present, the Maoliling Tunnel area faces a complex road environment, heavy traffic volume, a high proportion of trucks, and many hazardous chemicals vehicles, among other complex traffic conditions. To transform management difficulties and pain points into safety and smooth-flow points for public travel, the Maoliling Tunnel Management Office has adhered to technology empowerment, proactively explored optimal practices, and innovatively implemented in Zhejiang Province the shortening of camera spacing and dense camera deployment, reducing the camera spacing from 120 meters to 75 meters, with a total of 242 cameras deployed across the 15.96-kilometer single-tube length.

By leveraging the early-warning role of video surveillance cameras, the monitoring work model has been shifted from traditional manual detection to precise detection empowered by technology, enabling many traffic safety hazard risks to be effectively resolved at the initial stage.

It is reported that the Maoliling Tunnel Management Office has further taken camera resources as the starting point and the monitoring and command center as the hub, engaging in cross-data and cross-application resource complementarity with highway traffic police, and leading the establishment of a road-police collaboration model featuring "deep resource integration, data fusion and sharing, and integrated police-enterprise operation." Through the setup of a one-touch alarm bell system, it efficiently links the Maoliling Tunnel Office with the Yangjiaoshan and Wu'ao traffic police checkpoint points along the Yongtaiwen section, achieving rapid delivery of incident notifications and fast, coordinated response and handling by all parties.

At the same time, the Maoliling Tunnel Management Office has optimized the deployment of the tunnel integrated management and control platform, integrating various tunnel systems such as variable message signs and guidance systems, and precisely setting the activation modes of emergency plans for different locations, reducing operation time from 2 minutes to 15 seconds and effectively improving the targeted incident handling efficiency.

Deepening technology empowerment for safe tunnel operation, the Maoliling Tunnel Management Office focuses on intelligent detection of tunnel operating status and emergencies, adopting a "self-developed + jointly developed" approach to carry out research on key technologies for enhancing the intelligent operation and safety emergency response capabilities of long tunnel groups. With the support of a series of technologies such as the parking bay early-warning system, tunnel portal emergency warning system, speed control and guidance system, and holographic perception system, it promotes the realization of "all-time, all-weather, lane-level" tunnel traffic incident perception, with the perception accuracy of key events reaching over 97%.

Next, the Maoliling Tunnel Management Office will continue to explore specialized tunnel operation and management, further realize digital tunnel management, and effectively improve the level of tunnel safety control.