Abstract
The aerodynamic characteristics of commercial vehicles have been of interest to researchers for many years, primarily with a view to reducing drag and consequently improving fuel efficiency. Despite developments in the design of low drag vehicles proprietary devices in various forms remain the most effective method of reducing drag on the majority of vehicles in current use. The relative effectiveness of these devices is discussed in relation to the variety of vehicle geometries to which they are fitted and performance assessments are made, particularly with reference to the need for crosswind efficiency.
A general summary of potential aerodynamic developments is given, emphasizing the concept of matching the flowfield of cab and container to obtain optimum interference. The effectiveness of cab–container gap seals and trailer side skirts, both intended to reduce drag under crosswind conditions, is also discussed. All such developments are taken in the context of existing commercial and legal constraints likely to influence their impact on the next generation of commercial vehicles.
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