Which of the following is the correct visible light transmittance standard for vehicle windows that drivers must observe? (The vehicle is not used for VIP protection, ambulance service, or funerals.)
The visible light transmittance standard is set differently for the windshield and for the side windows on the left and right of the driver's seat (Article 49(1)3 of the Road Traffic Act, Article 28 of the Enforcement Decree). Thinking about which window matters more for visibility will keep you from swapping the two numbers.
Answer: ①
Explanation
Article 49(1)3 of the Road Traffic Act prohibits driving a vehicle whose windshield and side windows to the left and right of the driver's seat have visible light transmittance below the standard, and Article 28 of the Enforcement Decree sets that standard at 70 percent for the windshield and 40 percent for those side windows. Low transmittance makes it hard to see outside at night or in rain, which is dangerous. Options that swap the two figures or say the windshield has no standard are wrong.
Legal basis: 도로교통법 제49조 제1항 제3호, 시행령 제28조