M4: Speed Limits
(asked on 26th February 2024) - View Source
Question to the Department for Transport:
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.
This question was answered on 4th March 2024
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.