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## Question and Answer on Illumination Requirement for Street Lighting.
1. **What is the illumination requirement for street lighting?**.
The illumination requirement for street lighting is typically measured in lux, which is a unit of measurement for illuminance. The level of illumination needed for street lighting depends on the type of road, the speed limit, and the surrounding environment.
2. **How is the illumination requirement determined for different types of roads?**.
The illumination requirement for different types of roads is determined based on factors such as traffic volume, speed limit, and surrounding land use. For example, highways and arterial roads typically require higher levels of illumination compared to residential streets. This is to ensure the safety of drivers and pedestrians.
3. **What are the recommended illumination levels for different types of roads?**.
The recommended illumination levels for different types of roads are as follows:
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- Highways and arterial roads: 20-50 lux.
- Collector roads: 10-20 lux.
- Local streets: 5-10 lux.
4. **How is the uniformity of illumination taken into consideration for street lighting?**.
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The uniformity of illumination is an important factor to consider for street lighting. It refers to the even distribution of light on the road surface. A uniform lighting design helps reduce glare and shadows, providing a safer and more comfortable environment for road users.
5. **What are the common types of street lighting fixtures used to meet illumination requirements?**.
Common types of street lighting fixtures used to meet illumination requirements include high-pressure sodium lamps, metal halide lamps, and LED lights. LED lights are becoming increasingly popular due to their energy efficiency, long lifespan, and flexibility in design.
6. **How can proper maintenance help ensure the effectiveness of street lighting in meeting illumination requirements?**.
Proper maintenance of street lighting fixtures is essential to ensure they meet illumination requirements. Regular inspections, cleaning, and bulb replacement can help maintain optimal lighting levels and uniformity. Additionally, addressing any issues promptly can help prevent safety hazards and ensure the effectiveness of street lighting.
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