Many people driving on highways often notice that, except for special sections like tunnels and bridges, there are almost no streetlights. This raises the question: Why do ordinary city roads have streetlights, but highways with higher speeds lack them?
1. Safety Considerations: Headlights Are Sufficient
Highways are designed to be closed and fully grade-gapped, meaning there are no pedestrians or non-motorized vehicles, and no intersections. Vehicles rely on headlights for illumination, which is sufficient for safe driving.
Advantages of Headlights:
· Headlight coverage automatically adjusts according to vehicle speed, providing greater flexibility.
· Streetlights alternate between bright and dim lighting, which can easily cause visual fatigue.
· Headlights are better adapted to varying weather conditions.
2. Economic Considerations: High Costs
The investment and maintenance costs of installing and maintaining streetlights are extremely high. my country's expressway mileage exceeds 160,000 kilometers. If all of them were equipped with streetlights:
· Construction cost: Approximately 200,000 to 300,000 yuan per kilometer, total investment would reach tens of billions of yuan.
· Electricity bills: Annual electricity bills would exceed tens of billions of yuan.
· Maintenance costs: Daily maintenance requires significant manpower and resources.
These costs will ultimately be passed on to consumers through tolls, increasing the social burden.
3. Actual Results: Not Ideal
Practice has proven that installing streetlights on highways does not necessarily improve safety:
(1) Streetlights have limitations, and blind spots still exist.
(2)Glare can actually affect drivers' vision.
(3)Alternating light and dark conditions can cause visual illusions and increase fatigue.
4. Exceptions for Special Sections
Of course, highways will be equipped with streetlights in the following special sections:
· Tunnels: where sudden changes in light require transitional lighting.
· Extra-large bridges: where complex structures require additional lighting.
· Interchanges: where lanes intersect, requiring guidance lighting.
· Accident-prone sections: where additional lighting is required as needed.
5. Future Development Trends
With technological advancements, intelligent lighting systems are gradually being implemented on highways:
· Intelligent photosensitive systems: automatically adjust to ambient brightness.
· LED energy-saving technology: reduces energy costs.
· Solar streetlights: utilize clean energy.
· Intelligent Control Systems: Achieving On-Demand Lighting
Conclusion
The decision to eliminate streetlights on highways is a scientific one, backed by professional research and proven practice. It's the result of comprehensive consideration of safety, economy, and practicality. As drivers, we need to maintain our vehicle's lighting in good condition and use high and low beams appropriately to ensure safe driving.
Next time you're driving on a highway at night, don't wonder why there are no streetlights. The scientific design has taken every aspect into consideration. All we need to do is obey traffic rules and drive safely.
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