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42% of children in London switch from car to walking, cycling to school
About 4 in 10 (42%) children in London switched from travelling by car to walking, cycling or public transport following the introduction of the Ultra-Low Emission Zone (ULEZ), according to a study.
The study was conducted by a team of researchers at the University of Cambridge and Queen Mary University of London to examine the impact of the ULEZ on how children travelled to school. The research was part of the CHILL study (Children’s Health in London and Luton).
The study examined data from almost 2,000 children aged 6 to 9 years attending 84 primary schools in London and the control area, Luton. 44 schools were located with catchment areas within or bordering London’s ULEZ, and these were compared to a similar number in Luton and Dunstable (acting as a comparison group). The inclusion of the comparison site enabled the researchers to draw more robust conclusions and increased confidence in attributing the observed changes to the introduction of the ULEZ.
Only one in 5 (20%) children in Luton swapped from car travel to active modes, while a similar number (21%) switched from active to car travel. This means that children in London within the ULEZ were 3.6 times as likely to shift from travelling by car to active travel modes compared to those children in Luton and far less likely (0.11 times) to switch to inactive modes.
In April 2019, London introduced the ULEZ to help improve air quality by reducing the number of vehicles on the road that do not meet emissions standards. According to Transport for London, the central London ULEZ reduced harmful nitrogen oxides by 35% and particulate matter by 15% in central London within the first 10 months of its introduction.
The impact of the ULEZ on switching to active travel modes was strongest for those children living more than half a mile (0.78km) from school. This was probably because many children who live closer to school already walked or cycled to school prior to the ULEZ and therefore there was more potential for change in those living further away from their school.
The study’s first author, Dr Christina Xiao from the Medical Research Council (MRC) Epidemiology Unit at the University of Cambridge, said “The introduction of the ULEZ was associated with positive changes in how children travelled to school, with a much larger number of children moving from inactive to active modes of transport in London than in Luton.”
“Given children’s heightened vulnerability to air pollution and the critical role of physical activity for their health and development, financial disincentives for car use could encourage healthier travel habits among this young population, even if they do not necessarily target them.”
Joint senior author Dr Jenna Panter from the MRC Epidemiology Unit, University of Cambridge, said “The previous Government was committed to increasing the share of children walking to school by 2025 and we hope the new Government will follow suit. Changing the way children travel to school can have significant effects on their levels of physical activity at the same time as bringing other co-benefits like improving congestion and air quality, as about a quarter of car trips during peak morning hours in London are made for school drop-offs.”
After ULEZ was introduced in Central London, the total number of vehicles on the roads fell by 9%, and by one-third (34%) for vehicles that failed to meet the required exhaust emission standards, with no clear evidence of traffic moving instead to nearby areas.
Joint senior author Professor Chris Griffiths from the Wolfson Institute of Population Health, Queen Mary University of London, said “Establishing healthy habits early is critical to healthy adulthood and the prevention of disabling long term illness, especially obesity and the crippling diseases associated with it. The robust design of our study, with Luton as a comparator area, strongly suggests the ULEZ is driving this switch to active travel. This is evidence that Clean Air Zone intervention programs aimed at reducing air pollution have the potential to also improve overall public health by addressing key factors that contribute to illness.”
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