The Department for Transport has provided the following answer to your written parliamentary question (15521):
Question:
To ask the Secretary of State for Transport, what criteria are used to determine when temporary air quality speed limits are used on the M4 near Heathrow. (15521)
Tabled on: 26 February 2024
Answer:
Guy Opperman:
National Highways implemented a speed restriction of 60mph on the M4 westbound at junctions 3 to 4 in December 2022 to achieve nitrogen dioxide (NO2) compliance in the shortest possible time.
The answer was submitted on 04 Mar 2024 at 14:32.
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