Engineering English
Annual Average Daily Traffic (AADT)
Civil Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: The Annual Average Daily Traffic is the total traffic volume on a highway segment over a year divided by 365 days. It is a fundamental metric for highway planning, design, and operational analysis.
Example in context
“The highway widening project uses the AADT of 45,000 vehicles to determine the number of required lanes.”
“Otoyol genişletme projesi, gerekli şerit sayısını belirlemek için 45,000 araçlık AADT kullanır.”
Where engineers use it
AADT is used in highway design to estimate traffic loads, in pavement design for structural analysis, and in traffic operations for capacity assessment. Engineers rely on AADT for planning maintenance, safety studies, and environmental impact analysis.
Synonyms: ADT
Practice: can you use “Annual Average Daily Traffic (AADT)” at work?
You are given traffic counts from 12 months on a two-lane road. Determine the AADT and recommend whether widening is needed based on volume thresholds.
Show a model answer
“Calculate the AADT for this rural highway segment.”
“Annual Average Daily Traffic (AADT)” in 21 languages
| English | Annual Average Daily Traffic (AADT) |
|---|---|
| Turkish | Yıllık Ortalama Günlük Trafik (AADT) |
| French | Trafic Journalier Annuel (TJA) |
| German | Jahresdurchschnittliche tägliche Verkehrsstärke (JDTV) |
| Spanish | Tráfico Promedio Diario Anual (TPDA) |
| Chinese | 年平均日交通量 (AADT) |
| Arabic | متوسط الحركة اليومية السنوية (AADT) |
| Portuguese | Volume Diário Médio Anual (VDMA) |
| Russian | Среднегодовая суточная интенсивность движения (AADT) |
| Japanese | 年平均日交通量 (AADT) |
| Italian | Traffico Medio Giornaliero Annuale (AADT) |
| Vietnamese | Lưu lượng giao thông trung bình ngày năm (AADT) |
| Hindi | वार्षिक औसत दैनिक यातायात (AADT) |
| Thai | ปริมาณการจราจรเฉลี่ยรายวันต่อปี (AADT) |
| Indonesian | Lalu Lintas Harian Rata-rata Tahunan (LHRT) |
| Korean | 연평균 일일 교통량 (AADT) |
| Bengali | বার্ষিক গড় দৈনিক ট্রাফিক (AADT) |
| Dutch | Jaarlijkse Gemiddelde Dagelijkse Verkeersintensiteit (AADT) |
| Swedish | Årsmedeldygnstrafik (ÅDT) |
| Finnish | Vuosittainen keskimääräinen päiväliikenne (AADT) |
| Ukrainian | Середньорічна добова інтенсивність руху (AADT) |
Frequently asked questions
What does Annual Average Daily Traffic (AADT) mean in engineering?
The Annual Average Daily Traffic is the total traffic volume on a highway segment over a year divided by 365 days. It is a fundamental metric for highway planning, design, and operational analysis. In Civil Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce Annual Average Daily Traffic (AADT)?
Annual Average Daily Traffic (AADT) is pronounced /ˌeɪ.eɪ.diːˈtiː/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is Annual Average Daily Traffic (AADT) used in a sentence?
Example from an engineering context: “The highway widening project uses the AADT of 45,000 vehicles to determine the number of required lanes.”
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