M8 Woodside viaducts decision matters more than just for Glasgow |
The decision on the Woodside viaducts on the M8 affects more than just Glasgow and must be the right choice, writes Herald columnist Kingsley Omeihe
Transport Scotland is currently consulting on the future of the M8 Woodside Viaducts, with options including repair, replacement or removal.
This isn’t theoretical, it’s a live policy choice that affects how the central belt works day to day.
But what happens when Scotland’s most important motorway becomes its biggest economic bottleneck?
For decades, the M8 has quietly served as the economic spine of Scotland’s central belt. It links Glasgow and Edinburgh while connecting the towns, hospitals and universities that sit between them.
We can’t emphasise enough how critically important this infrastructure is for supporting the economy, including the logistics hubs and businesses that together form the economic heart of the central belt.
When the M8 moves freely, the central belt functions almost like a single economic system. When it slows, the entire system becomes less efficient.
This alone should give policymakers pause for thought. A sceptic might call this a stretch. But importantly, this isn’t just a theoretical observation.
Anyone who uses the road regularly already knows the problem. Congestion has become routine.
And that should concern us. Journeys that should be predictable become uncertain. Deliveries run late.
Evidence suggests that commuters leave earlier and arrive home later. Businesses increasingly build delays into their schedules simply to cope with the uncertainty.
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None of these inconveniences appears dramatic on its own. But they represent something economists worry about a great deal. They represent friction. Yet the devil remains in the details.
What happens when workers can no longer reach their jobs predictably? Can a regional economy remain fully productive if firms struggle to move goods efficiently?
How much collaboration is lost when universities and businesses become harder to reach in practical terms? And how should we judge the pressure on hospitals serving patients across regions when the infrastructure linking them becomes less reliable?
Those questions determine how serious a transport constraint becomes when tested by the demands of a modern economy.
Here we offer two perspectives.
First, economists sometimes describe this as the economics of distance – the further apart people, firms and ideas are in practical terms, the weaker their economic interaction becomes.
Good infrastructure shortens that distance. Poor infrastructure lengthens it.
So when distance increases, even slightly, the efficiency of an entire regional economy begins to fall.
Second, it is useful to think about the economy as a network rather than a collection of isolated places.
Cities, firms and institutions are nodes within that network, while infrastructure provides the links between them.
The stronger and faster those links are, the more effectively the network functions. When links weaken, the entire system becomes less productive.
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At its broadest level, the pressure on the M8 also reflects the transformation of the Scottish economy itself. When much of the motorway network was first designed, the central belt still revolved around traditional industry.
Production was concentrated in large plants. Even commuting patterns were relatively predictable and supply chains were simpler.
Today the geography of economic activity looks very different. Workers commute between cities rather than within them.
Businesses recruit talent from across a wider area. Supply chains now connect warehouses and distribution centres that barely existed when the motorway system was first conceived.
In effect, the central belt has evolved into something closer to a single interconnected economic zone. That makes the infrastructure linking it more important than ever.
What matters for policy is the impact of that infrastructure on the wider economy. Better connectivity does more than shorten journeys. In fact, it expands opportunity.
Someone living in Paisley can realistically take a job in Livingston. A business based in Coatbridge can recruit talent from multiple cities.
Freight operators can move goods efficiently between suppliers, warehouses and ports. Economists have a term for the productivity boost that comes from this kind of connectivity. We call it agglomeration.
When people, ideas and investment move easily between places, economic activity becomes more dynamic.
The central belt already contains many of the ingredients required for this kind of economic clustering. What ties these assets together is connectivity.
And that connectivity runs directly through the M8. That’s why this decision matters.
The Woodside Viaducts route is one of the most heavily used stretches of motorway in Scotland and the effects of constrained capacity are felt far beyond Glasgow.
So where does this leave us? Debates about transport infrastructure today can’t ignore environmental realities.
Expanding road capacity raises legitimate concerns about emissions and long-term sustainability.
Some critics argue that increasing road capacity can encourage additional traffic over time, a phenomenon economists describe as induced demand.
These concerns deserve serious attention. Scotland has committed to ambitious climate targets.
And we believe that infrastructure policy must be consistent with those commitments. In this broader context, the M8 proposal should be viewed as part of a larger question about how Scotland organises its economic geography.
Large transport projects inevitably generate debate.
Communities will rightly ask questions about environmental impact, construction and disruption. Infrastructure policy only succeeds when it carries trust and public confidence.
Kingsley Omeihe is a senior lecturer at the University of the West of Scotland