Abstract
BackgroundPromoting active travel is an important part of increasing population physical activity, which has both physical and mental health benefits. A key benefit described by the then Scottish Government of the five-mile M74 motorway extension, which opened during June 2011 in the south of Glasgow, was that the forecast reduction in motor traffic on local streets would make these streets safer for walking and cycling, thus increasing active travel by the local population. The aim of the study was to evaluate the impact of new motorway infrastructure on the proportion of journey stages made actively (cycling or on foot) by individuals travelling in and out of the local area.MethodsData for the periods 2009–10 and 2012–13 were extracted from the Scottish Household Survey (SHS) travel diaries, which record each journey stage made during the previous day by a representative sample of the Scottish population aged 16 and over. Each individual journey stage was assigned to one of the following study areas surrounding existing and new transport infrastructure: (1) an area surrounding the new M74 motorway extension (n = 435 (2009–10), 543 (2012–13)), (2) a comparator area surrounding an existing motorway (n = 477 (2009–10), 560 (2012–13)), and (3) a control area containing no comparable motorway infrastructure (n = 541 (2009–10), 593 (2012–13)). Multivariable, multi-level regression analysis was performed to determine any between-area differences in change in active travel over time, which might indicate an intervention effect. Reference populations were defined using two alternative definitions, (1) Glasgow City and (2) Glasgow and surrounding local authorities.ResultsThe results showed an increase in the proportion of journey stages using active travel in all study areas compared to both reference populations. However, there were no significant between-area differences to suggest an effect attributable the M74 motorway extension.ConclusionsThere was no clear evidence that the M74 motorway extension either increased or decreased active travel in the local area. The anticipation by policy makers that reduced motorised traffic on local streets might increase journeys walked or cycled appears to have been unfounded.Electronic supplementary materialThe online version of this article (doi:10.1186/s12966-016-0403-9) contains supplementary material, which is available to authorized users.
Highlights
Promoting active travel is an important part of increasing population physical activity, which has both physical and mental health benefits
A recent review described the potential effect of increased walking and cycling in urban England and Wales on the National Health Service (NHS) could lead to a saving of approximately £17billion through the reduced prevalence of diseases associated with physical inactivity, if the combination of impacts found in local area studies were immediately realised across this area and maintained for a 20 year period [3]
Glasgow, the largest city in Scotland, displayed small increases in the proportion of journey stages which were walked or cycled but there were no between area differences in change in active travel for people living near the new M74 extension when compared to Glasgow and surrounding authorities
Summary
Promoting active travel is an important part of increasing population physical activity, which has both physical and mental health benefits. The aim of the study was to evaluate the impact of new motorway infrastructure on the proportion of journey stages made actively (cycling or on foot) by individuals travelling in and out of the local area. Increasing the proportion of journeys which are walked or cycled (‘active travel’) is an important component to increasing population level physical activity, which can translate into physical and mental health benefits of significant magnitude [1, 2]. A recent review described the potential effect of increased walking and cycling in urban England and Wales on the National Health Service (NHS) could lead to a saving of approximately £17billion through the reduced prevalence of diseases associated with physical inactivity, if the combination of impacts found in local area studies were immediately realised across this area and maintained for a 20 year period [3]. It is important that new infrastructure designs are supported by evidence to ensure effectiveness
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