questionText: To ask the Secretary of State for Transport, pursuant to the Answer of 1 September 2023 to Question 196948 on Motorways: Speed Limits, whether the Chief Scientific Adviser gave advice to his Department on the potential effect of the 60mph speed limit trial on motorways on air quality.
answerText: National Highways did not engage with the Chief Scientific Adviser on the research into changes in car and van emissions under different driving conditions.  
heading: Motorways: Speed Limits