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The Hidden Cost of Road Maintenance: The Impact of Battery and Hydrogen Trucks and Buses
Driving excellence.As the world transitions towards zero-emission vehicles (ZEVs) to combat climate change, a new challenge emerges: the increased road wear and maintenance costs associated with the heavier weight of battery electric vehicles (BEVs) and hydrogen fuel cell electric vehicles (HFCEVs). A recent study by John M. Low, D. R. Stuart Haszeldine, and Gareth P. Harrison sheds light on this hidden cost, particularly focusing on Scotland's road infrastructure.
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The Weight of Progress
The road wear study highlights that BEVs and HFCEVs are generally heavier than their internal combustion engine (ICE) counterparts due to the weight of batteries and fuel cells. BEVs in particular are significantly heavier, leading to a 20-40% increase in road wear, while HFCEVs cause a 6% increase. This increased weight translates directly into more frequent and costly road maintenance.
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Road Wear Potential and Impact
To quantify the impact, the researchers introduced the concepts of Road Wear Potential (RWP) and Road Wear Impact Factor (RWIF). These metrics help assess the wear caused by different vehicle types and the overall impact on the road network. The study found that heavy goods vehicles (HGVs) and buses, despite being a small fraction of the total vehicle fleet, account for around 87% of the RWIF.
Scenarios and Economic Implications
The study analyzed four scenarios: the current ICE-dominated fleet, an all-BEV fleet, an all-HFCEV fleet, and a "Like for Like" scenario where diesel vehicles are replaced by HFCEVs and petrol vehicles by BEVs. The all-BEV scenario would increase annual road wear in Scotland by approximately 31%, while the all-HFCEV and Like for Like scenarios would result in a 6% increase.
The economic implications are significant. Maintaining existing road conditions would require an additional £164 million per year for an all-BEV fleet and £31 million for an all-HFCEV fleet. These costs are primarily due to the increased wear from larger vehicles.
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Mitigation Strategies
To address the increased road wear, the study suggests several mitigation strategies:
- Setting Weight Limits: Implementing weight limits on roads to prevent excessive wear.
- Additional Axles: Requiring additional axles on heavier vehicles to distribute the load more evenly, although this would increase manufacturing costs and fuel consumption.
- Higher Road Standards: Constructing roads to higher standards to withstand the increased wear.
- Lighter Battery Technology: Future advancements in lighter battery technology and vehicle design could help reduce the impact.
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The Need for Durable Pavement Markings
As road wear increases – and with the anticipated increase in road maintenance due to heavier ZEVs – investing in more durable pavement markings becomes crucial. Durable markings can withstand the increased wear and tear, reducing the frequency of reapplication and ensuring that road safety standards are maintained.
Conclusion
The transition to zero-emission vehicles is a necessary step towards a sustainable future. However, it comes with hidden costs that need to be addressed. The increased road wear and maintenance costs associated with heavier BEVs and HFCEVs highlight the importance of planning and investment in road infrastructure. By adopting mitigation strategies and investing in durable pavement marking solutions such as polyurethane pavement markings, we can ensure that our roads remain safe and functional as we move towards a greener future.
This study serves as a crucial reminder that while the shift to ZEVs is essential for reducing emissions, it also requires careful consideration of the broader impacts on our infrastructure. Policymakers and road maintenance authorities must take these factors into account to ensure a smooth and sustainable transition.
By understanding and addressing the hidden costs of road maintenance, we can better prepare for the future and ensure that our roads are ready to support the next generation of vehicles.
Reference: Low, J.M., Haszeldine, R.S. & Harrison, G.P. The hidden cost of road maintenance due to the increased weight of battery and hydrogen trucks and buses—a perspective. Clean Techn Environ Policy 25, 757–770 (2023). https://doi.org/10.1007/s10098-022-02433-8
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