I. To begin with, the conclusion is this: you shouldn’t buy just one thermal imaging device.

When procuring a highway temperature‑monitoring and early‑warning system, it is not enough to evaluate only the specifications of a single thermal imager. A solution truly suited to highway applications should integrate both in‑tunnel fusion monitoring and vehicle‑temperature measurement outside the tunnel.

Inside tunnels, the focus is on fire detection, abnormal vehicle overheating, visual monitoring in smoky conditions, and temperature-based early warning.
Outside the tunnel, the focus is on whether there are abnormal temperature rises in the tires, brakes, engine compartment, or cargo compartment before vehicles enter key areas such as tunnels, bridges, and toll stations.
The backend platform focuses on license plate association, alarm logs, data querying, report generation and statistics, and coordinated response.

Therefore, when making a purchase, it is essential to verify whether the system can establish a complete closed-loop comprising “front-end temperature measurement + vehicle recognition + platform-based alerts + integration with information display boards and public address systems + data logging.”

II. First Check: Does the tunnel support dual-light fusion?

The tunnel environment is complex, and conventional visible-light surveillance is easily affected by high beams, low illumination, smoke, and glare. Thermal imaging can detect heat sources, but it lacks sufficient environmental detail. Dual-spectrum fusion devices can integrate these two types of information.

The SSK/NW-TX9800 employs both visible-light and infrared thermal imaging sensors, enabling real-time fusion of thermal and visible imagery. Infrared thermal imaging captures the location and temperature of heat sources, while visible-light imaging provides high-resolution details of the target.

Procurement Recommendation:
Don’t just choose standard cameras for tunnels.
Priority should be given to equipment that offers comprehensive capabilities, including visible-light imaging, thermal imaging, fused displays, picture-in-picture functionality, temperature measurement protocols, and intelligent analytics.

III. Second Look: Are the temperature‑checking protocols flexible?

Temperature monitoring inside tunnels does not involve measuring at a single point; rather, it requires establishing distinct rules based on vehicle traffic, road conditions, equipment zones, and areas with fire‑risk hazards.

The TX9800 supports three temperature‑measurement modes and 273 preset scenarios, with each scenario configurable to include 21 rules—comprising 10 point‑temperature measurements, 10 area‑temperature measurements, and 1 line‑temperature measurement. It offers two temperature ranges: –20°C to 150°C and 0°C to 550°C, with a measurement accuracy of ±2°C or ±2% of the reading.

Procurement Recommendation:
You need to check whether the device supports spot measurement, area measurement, and line measurement.
It depends on whether different alarm thresholds can be configured for various scenarios.
It depends on whether it supports simultaneous monitoring of multiple regions.
It is necessary to verify whether the temperature range and accuracy meet the requirements of tunnel safety monitoring.

IV. Third Check: Whether the vehicle over-temperature warning is linked to license plate recognition.

The core of the vehicle temperature‑monitoring system outside tunnels is not merely to detect elevated temperatures, but to identify which specific vehicle is overheating.

The front-end data acquisition system of the intelligent transportation solution’s vehicle over-temperature warning system comprises a temperature-sensing acquisition unit, a license‑plate recognition system, a temperature‑control and analysis unit, an LED information display, a high‑power public‑address speaker, fiber‑optic transmission equipment, an industrial Ethernet switch, and a backend management system. The system enables vehicle image capture, license‑plate recognition, temperature monitoring and assessment, database storage, LED display, and voice‑based alarm notification.

Procurement Recommendation:
The vehicle temperature‑measurement system must be integrated with license‑plate recognition, image capture, thermal imaging, and alarm logging.
Otherwise, on-site personnel will only know that there is a high temperature but won’t be able to identify which vehicle is involved, making subsequent response efforts extremely challenging.

V. Fourth Consideration: Whether the installation location is appropriate

The effectiveness of the highway temperature‑monitoring and early‑warning system is closely tied to the height at which the monitoring stations are installed. Temperature‑monitoring and warning points should be strategically placed on long uphill sections, long downhill stretches, approaches to bridges and tunnels, and before major mainline toll plazas. Information display boards can be positioned 500 to 1,000 meters upstream of these monitoring points to show the license plate numbers of vehicles exceeding the temperature threshold and to convey warning messages.

Procurement Recommendation:
After a long downhill, it is advisable to check for abnormal temperature rises in the brakes and tires.
The area immediately before the tunnel entrance is suitable for screening high-risk vehicles that are about to enter the enclosed space.
Before the toll station, it is appropriate to issue early warnings and provide guidance during the vehicle deceleration phase.
The service area entrance is suitable for directing abnormal vehicles to undergo inspection.
The area in front of the bridge is suitable for mitigating risks at the bridge and on hazardous road sections.

VI. Fifth Check: Does it support alarm linkage?

If the temperature‑monitoring system only triggers a pop‑up in the background, on‑site response efficiency will be limited. In high‑speed scenarios, multiple coordinated response mechanisms are required.

In intelligent transportation systems, the vehicle over‑temperature warning system can be integrated with LED message boards, public address systems, and a backend platform. The alarm‑triggering workflow encompasses vehicle approach, image capture, temperature measurement, data storage, over‑temperature detection, voice‑based alert issuance, display of alarm information on LED screens, and recording of data in the alarm database.

Procurement Recommendation:
The system shall support background alarms.
LED information board prompts should be supported.
Broadcast voice alerts should be supported.
Local and central platform logging should be supported.
Alarm data query and export should be supported.

VII. Sixth Consideration: Does the platform support distributed management?

Highway projects typically involve multiple locations, potentially including numerous tunnels, toll stations, road segments, and management centers. The system must support centralized control, decentralized control, and access‑rights management.

The vehicle over-temperature warning system can adopt a distributed architecture with a central control room and sub‑control rooms. The central control room manages all temperature‑sensing points across the entire project, while each sub‑control room oversees the points within its authorized scope; the central control room holds the highest priority. The system supports user access management, device information administration, alarm query, log management, and video preview.

Procurement Recommendation:
Small projects can focus on single-point monitoring capabilities.
Highway segment-level projects must adopt total‑and‑sub‑control management.
Multi-tunnel, multi-site projects must prioritize platform scalability and access control.

VIII. Seventh Consideration: Is the equipment suitable for harsh environments?

Highways and tunnels operate under demanding conditions over long periods, placing stringent demands on equipment stability. The TX9800 boasts an IP67 protection rating, a wide operating temperature range of –40°C to 70°C, PoE power support, and robust TVS surge and lightning‑protection design rated at 4 kV.

Procurement Recommendation:
Inside tunnels, it is essential to ensure dust control, moisture resistance, thermal stability, and long-term operational reliability.
Outside the tunnel, considerations include rain protection, lightning protection, surge protection, wind resistance, and the installation and compatibility of gantry structures.
Vehicle temperature‑monitoring stations should take into account network connectivity, power supply, lightning protection, and ease of maintenance.

IX. Procurement Recommendations

If the project’s primary focus is tunnel safety, a dual‑spectrum thermal‑imaging and visible‑light fusion temperature‑measurement system should be prioritized, with particular attention to thermal imaging, visible light, fusion capabilities, temperature‑measurement algorithms, intelligent analytics, and platform integration.
If the project’s primary focus is pre‑tunnel risk screening for vehicles, priority should be given to deploying an external vehicle overheating warning system, with particular emphasis on license‑plate recognition, vehicle heat‑map analysis, overheating detection, and integrated operation with LED information panels and public‑address systems.
If the project involves the comprehensive construction of a smart expressway, tunnel‑internal monitoring and vehicle‑temperature measurement outside the tunnel should be planned in an integrated manner, establishing a closed-loop system that encompasses front‑end sensing, back‑end management, and on‑site response.

Summary

When selecting a temperature‑monitoring and early‑warning system for highways, it’s not enough to evaluate the specifications of individual devices; you must assess whether the system provides integrated monitoring inside tunnels and over‑temperature alerts for vehicles outside. Inside tunnels, dual‑spectral fusion, thermal imaging temperature measurement, and intelligent analytics are required; outside tunnels, license‑plate recognition, vehicle heat‑map visualization, over‑temperature alarms, and coordinated activation of variable message signs and public‑address systems are essential. A truly valuable solution establishes a complete closed loop, linking front‑end detection, back‑end alerting, on‑site notifications, and data logging.

Corresponding Device Orientation (Important)

For different application scenarios, common corresponding device orientations include:

• Solution for Road Vehicle Overtemperature Warning System

https://www.settall.com/news_details/10.html

• Tunnel-Specific Dual-Optical Fusion Temperature Measurement System: SSK/NW-TX9800

             https://www.settall.com/products_details/SSK/NW-TX9800.html