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Traffic Category
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Category
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Exposure Description
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High
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Structure or Route located at or is adjacent to features (e.g. junctions, interchange, etc.) that frequently impose obstructions to traffic flow (i.e. resulting in queuing/slow moving traffic).
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Speed limit >40mph, with poor horizontal and vertical alignment (e.g. uneven carriageway, located on/near a bend or gradient, etc.)
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High Annual Average Daily Traffic (e.g. AADT > 25,000 vehicles)
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High volume of Commercial Vehicles (e.g. CV > 2,500 vehicles)
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High volume of Heavy Goods Vehicles
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Moderate
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Structure or route is located at or is or adjacent to features (e.g. junctions, interchange, etc.) that occasionally impose obstructions to traffic flow (i.e. resulting in queuing/slow moving traffic).
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Speed limit >20mph to ≤40mph, with poor horizontal and vertical alignment (e.g. uneven carriageway, located on/near a bend or gradient, etc.)
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Medium Annual Average Daily Traffic (e.g. AADT > 10,000 to ≤ 25,000 vehicles)
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Medium volume of Commercial Vehicles (e.g. CV > 1,000 to ≤ 2,500 vehicles)
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Medium volume of Heavy Goods Vehicles
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Low
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Structure or route or is or adjacent to features do not impose obstructions to traffic flow
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Speed limit ≤20mph, with good horizontal and vertical alignment (e.g. even carriageway, level and straight stretch route).
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Low Annual Average Daily Traffic (e.g. AADT≤ 10,000 vehicles)
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Low volume of Commercial Vehicles (e.g. CV ≤1,000 vehicles)
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Low volume of Heavy Goods Vehicles
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Note: It is considered that the traffic category would be influenced by the frequency, speed and concentration of traffic flows (especially HGVs) and would be dependend on the location, e.g. rural, urban, etc.
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