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Traffic impact studies in Dubai and Abu Dhabi: trip thresholds, local rates and ITE practice

In Dubai and Abu Dhabi, the peak-hour trip count does more than size the mitigation: it sets the study type, the review level and, in Dubai, the cost-sharing route. A worked example tests one mixed-use programme against both emirates' thresholds.

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Worked examples are illustrative and are not sealed engineering documents. Site-specific analysis requires a licensed engineer in the relevant jurisdiction. Regulatory references to other jurisdictions (e.g. California) are descriptive. Valerio Oricchio P.E.

1. The problem

A US-trained analyst preparing a traffic impact study (TIS) usually starts with the ITE Trip Generation Manual, applies the Trip Generation Handbook to choose a rate or an equation, and then sizes intersections and mitigation to the local agency’s level-of-service policy. In Dubai and Abu Dhabi, the same steps exist, but the forecast peak-hour trip number has extra legal weight:

  • In Dubai, it decides whether a TIS is needed, at which level it is reviewed, whether a traffic model and a cost-sharing agreement are required, and whether a later design change needs an amended or a new study [1].
  • In Abu Dhabi, it decides whether the developer submits a circulation plan, a TIS, or a transportation master plan [2].

Both emirates also use their own trip generation and parking rates manuals, not ITE rates, to predict those trips [1][2][3]. This article sets out the rules that can be verified from public sources, compares them with ITE practice, and works one hypothetical programme through both emirates’ thresholds.

2. The governing documents

2.1 Dubai: Administrative Resolution No. 603 of 2021

The RTA’s Director General issued Administrative Resolution No. (603) of 2021, the Implementing Bylaw of Law No. (6) of 2006 on the contribution of beneficiaries to the cost of roads and public transport, on 15 July 2021 [1]. It applies “in all zones of the Emirate, including Special Development Zones and free zones” (Art. 2). The English text is a translation; the Arabic prevails [1]. Its TIS provisions:

  • Trigger (Art. 4(b)): a TIS is required where a project’s trips exceed 150 trips during peak hours on affected roads. It is conducted at the beneficiary’s expense by an RTA-approved consultant (Art. 4(c)) [1].
  • Trip prediction (Arts. 1 and 4(b)): “Generated Trips” are calculated with the technical manuals adopted by the RTA; Art. 4(b) names the Trip Generation and Parking Rates Manual [1].
  • Study levels (Art. 6): Level One, 150–500 trips; Level Two, 501–1,500 trips; Level Three, more than 1,500 trips. Level Three requires a traffic model and a cost-sharing agreement [1].
  • Contribution (Arts. 5, 8–11): the consultant submits the TIS with an estimated contribution. Beneficiaries bear the full cost of roads, bridges, tunnels and junctions within the project boundary (Art. 8) and share the cost of certain elements outside it, within a cost-sharing area (Art. 9). The formulas are in the RTA’s Traffic Impact Studies Manual (Art. 11), not in the Resolution [1].
  • Design changes (Art. 12(b)): a trip increase below 5% needs no new study; 5–10% requires amending the study of the internal and access roads; above 10% requires a new study [1].
  • Time limit (Art. 15): a TIS is deemed incomplete if the consultant delays for more than 18 months [1].

The two RTA manuals named in the Resolution were not publicly openable when this article was written. Their rates and analysis criteria are therefore not quoted here.

2.2 Abu Dhabi: ITC TIS system

The Integrated Transport Centre (ITC) publishes, on the Abu Dhabi Mobility website, a manual for its online TIS system [2]. Its FAQ states:

  • Legal basis: Executive Council Resolution No. 13 of 2011, Article 3.1, requires a traffic impact study to be “conducted and approved by the department before issuing any building permit” (FAQ 1) [2].
  • Study type by trips (FAQ 7): a Circulation Plan for projects generating fewer than 100 trips per hour; a Traffic Impact Study for 100–2,500 trips per hour; a Transportation Master Plan above 2,500 trips per hour. Trips are counted in both directions, and the highest weekday peak is used [2]. (FAQ 9 says “more than 100” for a TIS, so the exact boundary at 100 should be confirmed with ITC.)
  • Trip rates: the “approved Trip Generation & parking rates Manual in the Emirate of Abu Dhabi” (FAQ 7, 8, 13) [2]. When the Department of Transport launched the manual in March 2013, it reported surveys of more than 400 sites in Abu Dhabi, Al Ain and the Western Region, covering more than 70 land uses [3].
  • Mitigation: the developer is responsible for “all the required road improvements within the plot boundaries and the roads leading to it” (FAQ 19) [2].
  • Parking (FAQ 14–15): in development areas, 100% of parking demand must be provided on the plot. Elsewhere, at least 70% must be on the plot; the remaining 30% can be covered by a shortage fee of AED 50,000 per space in urban areas or AED 5,000 outside them [2]. Parking demand is taken from the same manual (FAQ 13); an earlier rate schedule, Technical Circular 2009-TIS-0001, is still posted on the Abu Dhabi Mobility site [4], so confirm with ITC which rates apply.

ITC also announced 2024 Transport Impact Studies Guidelines, developed with the Department of Municipalities and Transport [11]. The public announcement describes modelling and submission procedures but gives no thresholds, and the Guidelines themselves were not publicly openable for this article.

2.3 Regional context

A 2020 UN-ESCWA training workshop on traffic impact studies compared regional guidelines. It describes the Dubai guidance as providing trip generation and parking rates, the Abu Dhabi guidance as setting out when a TIS is needed, the method and horizon years, Qatar’s thresholds as no study below 100 trips, a reduced study for 100–500 trips and a detailed study above 500, and Jeddah’s requirement for AM, PM and noon peaks with three future scenarios at 5-year intervals [5].

2.4 ITE practice

  • Trip Generation Manual: the current edition is the 12th, released by ITE in August 2025. It removes all pre-1990 data, adds more than 550 study sites and nine new land-use codes, and adds a chapter on post-pandemic travel trends [6][7]. Agencies adopt it on their own schedule: for example, WisDOT requires the 12th edition for TIAs started on or after 1 July 2026 [6].
  • Trip Generation Handbook, 3rd edition (first issued as proposed Recommended Practice RP-028C in October 2014 [8]; current version RP-028D, September 2017 [10]; ITE has started a revision, expected to conclude in 2027 [12]). It adds pass-by data and guidance on person trips and on urban, mixed-use and transit-served sites [8]. As summarised by Knoxville–Knox County Planning [9], the Handbook prefers the fitted-curve equation when an equation is given, at least 20 data points are available and R² ≥ 0.75, and prefers the average rate when there is no equation and the standard deviation is ≤ 55% of the average rate. The memo does not say what to do when neither condition holds; collecting local data, agreed with the reviewer, is the usual response.

3. What changes for an ITE-trained analyst

Step Typical US practice (ITE) Dubai (AR 603/2021) Abu Dhabi (ITC)
Trip rates ITE Trip Generation Manual 12th ed., or local rates where the agency requires them [6] RTA Trip Generation and Parking Rates Manual (Art. 4(b)) [1] Abu Dhabi Trip Generation & Parking Rates Manual [2][3]
What the trip total triggers The agency’s own TIA threshold and scope TIS above 150 peak-hour trips; Levels 1–3; model and cost-sharing at Level 3 [1] CP < 100, TIS 100–2,500, TMP > 2,500 trips/h, both directions [2]
Who prepares it Set by each agency’s TIA rules RTA-approved consultant (Art. 4(c)) [1] Certified traffic consultant (FAQ 11) [2]
Funding of off-site works Proportionate-share or impact-fee rules of the agency Full cost inside the boundary, shared cost in the cost-sharing area (Arts. 8–9) [1] Developer funds required improvements on the plot and on the roads leading to it (FAQ 19) [2]
Design change after approval Agency judgement < 5% none; 5–10% amend; > 10% new study (Art. 12(b)) [1] Not stated in the FAQ

Three practical consequences follow:

  1. Do not import ITE rates by default. Both emirates name their own manuals. ITE data may still help to sense-check a land use that the local manual does not cover, but that should be agreed with the reviewing authority.
  2. Rate precision has a cost. Near a threshold (150, 500, 1,500 in Dubai; 100, 2,500 in Abu Dhabi), the forecast determines the study level and the review path. Document the rate source and its statistics.
  3. The trip total is a contract number. In Dubai, a later increase of 5% or more changes the approved study [1]. Freeze the development programme before the TIS, or carry a margin.

4. Worked example (hypothetical)

All rates and data below are invented for illustration. They are not taken from the RTA, Abu Dhabi or ITE manuals.

Programme. A mixed-use plot with 600 apartments, 20,000 m² GFA of offices and 8,000 m² GFA of retail.

Step 1: peak-hour trips with hypothetical local rates (two-way, highest weekday peak hour):

Use Size Rate (hypothetical) Trips
Residential 600 units 0.35 per unit 210
Office 200 × 100 m² GFA 1.6 per 100 m² 320
Retail 80 × 100 m² GFA 3.0 per 100 m² 240
Total 770

No internal capture or modal reduction is applied; whether and how such reductions are allowed is a matter for the local manual and the reviewer.

Step 2: rate or equation for the office use? Suppose the office data set behind the rate has 24 sites, a fitted equation with R² = 0.71, a mean of 1.6 trips per 100 m² and a standard deviation of 0.95. The equation fails the R² ≥ 0.75 test. The average rate fails the standard-deviation test: 0.95 / 1.6 = 59% > 55% [9]. Neither criterion is met, so the rate should be discussed with the reviewer, and local counts at comparable offices are worth proposing.

Step 3: classification.

  • Dubai: 770 > 150, so a TIS is required (Art. 4(b)). 770 lies in 501–1,500: Level Two (Art. 6). No traffic model or cost-sharing agreement is triggered by the study level [1].
  • Abu Dhabi: 770 lies in 100–2,500: Traffic Impact Study, not a transportation master plan [2].
  • For comparison, under the Qatar thresholds reported by UN-ESCWA, 770 > 500 would require a detailed study [5].

Step 4: sensitivity to imported rates. If the analyst had used rates 40% higher (for example, unadjusted car-oriented rates), the total would be 770 × 1.4 = 1,078 trips. The Dubai level would not change (still 501–1,500), but every downstream number would: turning volumes, mitigation, and the contribution calculated under the RTA TIS Manual (Art. 11) [1].

Step 5: a design change after approval. The developer adds 1,500 m² GFA of retail: +15 × 3.0 = +45 trips, to 815. The increase is 45 / 770 = 5.8%, which falls in the 5–10% band (applied to any peak hour) of Art. 12(b): the approved study must be amended [1]. A change of 38 trips or fewer (< 5%) would not have required any update.

Step 6: parking (Abu Dhabi rules applied to the same programme). Suppose the parking manual gives a demand of 900 spaces and the plot is outside a development area in an urban zone. At least 70%, i.e. 630 spaces, must be on the plot. The other 270 may be covered by the shortage fee: 270 × AED 50,000 = AED 13.5 million [2]. That figure is often large enough to change the basement design, so run it early.

units, off, ret = 600, 20000, 8000
t = units*0.35 + off/100*1.6 + ret/100*3.0             # 770
lvl = 'L1' if t <= 500 else 'L2' if t <= 1500 else 'L3' # Dubai AR 603 Art. 6
ad  = 'CP' if t < 100 else 'TIS' if t <= 2500 else 'TMP'
print(t, lvl, ad, t*1.4)                                # 770 L2 TIS 1078
d = (t + 1500/100*3.0)/t - 1                            # +5.8 %
print(round(d*100,1), 'amend' if 0.05 <= d <= 0.10 else 'new' if d > 0.10 else 'none')
print(0.95/1.6, 0.7*900, (900-630)*50000)               # 0.59, 630, 13.5 M AED

5. Limitations

  • Manuals not opened. The RTA Traffic Impact Studies Manual and Trip Generation and Parking Rates Manual, the Abu Dhabi Trip Generation & Parking Rates Manual and the 2024 Transport Impact Studies Guidelines were not publicly openable for this article. Their analysis periods, horizon years, LOS or v/c criteria, growth rates and reduction rules are therefore not covered. Obtain the current versions from RTA and ITC before scoping.
  • Translations. The Dubai Resolution’s English text is a translation; the Arabic prevails [1]. The ITC manual is a system guide with an FAQ, not a technical standard [2].
  • Boundaries. “More than 150” in Dubai and the boundary at exactly 100 trips in Abu Dhabi should be confirmed with the authority when a forecast sits on a threshold.
  • Changing rules. Thresholds and fees can change by resolution. Check the current text at the time of scoping.
  • Secondary sources. The regional comparison [5] and the Handbook criteria [9] are taken from secondary summaries; use the primary documents for a submission.

6. Practitioner checklist

  1. Identify the emirate and zone (including free zones in Dubai, Art. 2) and the reviewing authority.
  2. Obtain the current local trip generation and parking rates manual and, in Dubai, the RTA TIS Manual.
  3. Fix the development programme (land uses, GFA, units) before forecasting.
  4. Forecast two-way peak-hour trips with the local rates; document rate statistics and any reductions agreed with the reviewer.
  5. Classify: Dubai Level 1/2/3 (150 / 500 / 1,500), Abu Dhabi CP/TIS/TMP (100 / 2,500).
  6. At Dubai Level Three, plan for a traffic model and a cost-sharing agreement.
  7. Run parking requirements in parallel; in Abu Dhabi, compute the on-plot minimum and any shortage fee.
  8. Estimate the contribution or the developer-funded works with the authority’s method, not a US impact-fee analogy.
  9. Track programme changes against the Dubai 5% / 10% bands.
  10. Record every input and assumption so the reviewer can reproduce the forecast.

For an independent review of a study like this, see peer review or get in touch.

Sources

  1. Government of Dubai, Administrative Resolution No. (603) of 2021 Issuing the Implementing Bylaw of Law No. (6) of 2006 Concerning Contribution of Beneficiaries to the Cost of Roads and Public Transport Contracts, RTA, 15 July 2021 (English translation; Arts. 1, 2, 4–6, 8–12, 15). https://dlp.dubai.gov.ae/Legislation%20Reference/2021/Administrative%20Resolution%20No.%20(603)%20of%202021%20Issuing%20the%20Implementing%20Bylaw%20of%20Law%20No.%20(6)%20of%202006.html
  2. Integrated Transport Centre (ITC), Abu Dhabi, Manual TIS — Traffic Impact Study System (system guide and FAQ, undated). https://admobility.gov.ae/-/media/project/dot/itc/files/e-library/tis--english.pdf
  3. Parking.net, “Department of Transport Launches the New Trip Generation and Parking Rates Manual for the Emirate of Abu Dhabi”, 5 March 2013. https://www.parking.net/parking-news/-department-of-transport-launches-the-new-trip-generation-and-parking-rates-manual-for-the-emirate-of-abu-dhabi
  4. Abu Dhabi, Emirate of Abu Dhabi Parking Rates, Technical Circular 2009-TIS-0001. https://admobility.gov.ae/-/media/files/the-approved-technical-requirements-table.pdf
  5. Semaan, R., Wehbe, R. Training of Trainers Workshop on Traffic Impact Studies of Commercial Buildings and Facilities in Palestinian Cities, UN-ESCWA, 30 Nov–3 Dec 2020, Day 3. https://archive.unescwa.org/sites/www.unescwa.org/files/events/files/tis_final_presentation_-_workshop_palestine_day_3.pdf
  6. Porter, B. (WisDOT State Traffic Engineer), memo on the ITE Trip Generation Manual, 12th Edition, 26 June 2026. https://wisconsindot.gov/dtsdManuals/traffic-ops/manuals-and-standards/tripgen12memo.pdf
  7. ITE, Trip Generation, 12th Edition (publication page). https://www.ite.org/navigation/technical-resources/publications/trip-generation/
  8. ITE Community, “ITE Releases Trip Generation Handbook, 3rd Edition”, 6 October 2014. https://community.ite.org/blogs/marianne-saglam/2014/10/06/ite-releases-trip-generation-handbook-3rd-edition
  9. Knoxville–Knox County Planning, memo on ITE Trip Generation 10th Edition, 15 October 2018 (summarising the Trip Generation Handbook, 3rd ed.). https://knoxplanning.org/news/2018/305/ITE-Trip-Generation-10th-edition-memo.pdf
  10. ITE, Active ITE Recommended Practices, 4 December 2025. https://www.ite.org/ITEORG/assets/File/Standards/2025_12_04%20Active%20ITE%20RPs.pdf
  11. Zawya (press release), The Integrated Transport Centre (Abu Dhabi Mobility) launches the 2024 Transport Impact Studies Guidelines, 2024. https://www.zawya.com/en/press-release/government-news/the-integrated-transport-centre-abu-dhabi-mobility-launches-the-2024-transport-impact-studies-guidelines-rh8frjfn
  12. ITE, Trip Generation Handbook (web page, update status). https://www.ite.org/technical-resources/topics/trip-and-parking-generation-v3/trip-generation-handbook/

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