To ask the Secretary of State for Transport, pursuant to the Answer of 8 October 2024 to Question 5795 on M25: Noise, how much Next Generation Concrete Surfacing is expected to reduce noise levels by.
Trials conducted on the M1 suggest that Next Generation Concrete Surfacing (NGCS) could yield a reduction of between 3.4 and 3.7 dB(A) in the noise generated between the vehicle tyre and the concrete road surface. 
M25: Noise