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AADT

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Average Annual Daily Traffic
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AADT stands for Annual Average Daily Traffic flow, and is the generally accepted method of comparing traffic flows on roads. In its simplest form, it is the total traffic flow over a year in both directions divided by 365. More complex forms used for traffic modelling concentrate on the busiest 12, 16 or 18 hours of the day, and are able to break down the traffic flow by hour, direction and vehicle type.

AADT figures can be viewed at the Department for Transport's Traffic Counts website.



AADT
Road Basics
Physical layoutSingle track • Single carriageway • Dual carriageway • High Quality Dual Carriageway • Road Widths • Urban Streets
Legal typesAll-purpose Road • Special Road • Motorway • Trunk road • Principal road • Primary Route • Non Primary Route • Right of Way • Unadopted road
Road numbers1922 Road Lists • Classification • Classified Unnumbered Road • Unclassified • Defunct road • Euroroutes • MoT Maps • National Cycle Network • Numbering principles • Numbering anomalies • Recycled number • Unallocated numbers • Fictional Road Numbers • Junction numbers
Road FeaturesAutomatic Bollard • Balancing Pond • Arterial Road • Bypass • Cannon • Cattle Grid • CD Lanes • Central Reservation • Chopsticks • Crash Barrier • Cuttings and Embankments • Cycle Lane • Escape lane • Expressway • Fingerpost • Flare • Ford • Gore • Green Bridge • Green Wave • Hairpin bend • Hard shoulder • Island • Junction • Layby • Local Access Road • Managed Motorways • Multiplex • No-Car Lane • Oxbow Road • Parapet • Petrol station • Ramp Metering • Retaining Wall • Road Studs • Roadside Art • Roadworks • Secret motorway • Signage • Smart Motorway • Snow pole • Speed Limit • Spur • Street Lighting • Surface Dressing • Temporary terminus • Throughpass • Tidal Flow • Tiger tail • Toll booth • Traffic cone • Traffic Signals • Tunnel • Weaving • Wig-Wag Signals
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Other termsAnderson report • Highway Authority • Motorway alphabet • Pre-Worboys • Primary Destinations • Roads by 10 • Transport alphabet • Worboys report
AcronymsAADT • ANPR • ATM • DfT • GSJ • HA • HATO • HE • HETO • HQDC • LAR • LILO • MOVA • NCN • NMU • NRA • PTS • PFI • SABRE • SCOOT • SON • SOX • SRN • TEN-T • TERN • TfL • TII • TOTSO • TRO • TSM • TSRGD • UTC • VAS • VMS • VSL