Traffic Impact Assessment Report

Generated:

Crompton Traffic Analysis System

Project / Site -

Primary Counter ID -

Base Year -> Opening Year -

Report Mode Engineering Summary

Traffic Impact Assessment

database-integrated directional traffic, queue metrics, and capacity checks

Quick start guide

Search and apply a site/address first, then confirm the auto-filled parameters.
Review user-input fields marked with red labels before calculating.
Use Calculate All Metrics to refresh all tables/charts together from one source of truth.
Optional modules are exploratory; validate outputs with engineering judgement before reporting.

State Database

Current database: Queensland (QLD)

Tip: Include suburb/city to improve geocoding reliability and speed.

Analysis Results

Match Type: -
Search Address: -
Geo Source: -
Road/Location: -

Using 3+ Reference Points (within 5km)

Each road now shows a suggested AADT and one road-level % slider set (no duplicate sliders). Reference cards stay interactive for Use/Remove and show informative weighting context. Final traffic volume is a weighted average, not a sum.

Choose Calculation Method

Use Weighted Average (Auto) Manual Traffic Generation

Manual Traffic Generation

Land Use Scenario:

Reference Source (Auto by State):

Quantity:

Daily Trip Rate (Per Unit):

AM Peak %:

PM Peak %:

💡 Tip: Reference source is selected automatically from the state database above (QLD -> TMR Guide, NSW -> RMS NSW Guide). Peak % is the portion of daily trips occurring in peak hour. AM/PM peaks show directional splits (In/Out) based on land use type.

Calculated AADT (Weighted Average of References)

Detected Area Type: - • Type%: 100%

Weighted Avg AADT: - vehicles/day

AADT to use: - vehicles/day

Calculated D1 AADT: -

Calculated D2 AADT: -

Input Guide

🔴 Red input boxes require user entry/review and are editable.

🟢 Green input boxes are auto-filled or read-only. If marked editable, they can still be adjusted.

1. Select Site from Map or Manual Entry (Site ID)

Use either the database search or map marker selection. Once a site is selected, values below are synchronized automatically.

Search & Select from Database

Data Source

No custom upload loaded.

Or manually enter AADT & parameters below

Site Location

Select a site from search or click a marker to auto-fill inputs.

Map Status: Waiting for site data...

Analysis Parameters 🔴 User Input | 🟢 Auto-filled

All manual entry fields are shown in red. All auto-filled fields are shown in green, and each editable auto-filled field is explicitly marked.

✓ Auto-filled from Database

🟢 Green fields are auto-filled. If a label says "editable", you can adjust that value; otherwise treat it as read-only source data.

Site ID

Base Year

HV % (from DB)

D1 AADT (from DB)

D2 AADT (from DB)

AADT (Auto-calc)

AM Peak Flow (Inbound Direction)

Select the primary direction of travel during the morning commute.

Growth Rate (% p.a.) (Auto-filled, editable)

(from DB if available, else defaults to 2.5%; editable)

Target Year (Auto-filled, editable)

Target Year Projection (Grouped)

Predicted AADT @ Opening Year

Predicted D1 AADT @ Opening Year

Predicted D2 AADT @ Opening Year

Road Scenario Volume Predictor

Predict road traffic using turning lanes, through lanes, movement split and real operating conditions.

✎ You Must Fill These

🔴 Red fields require user input/review before running calculations. These values are intended to be editable.

Terrain *

Road Trains (RTR)? *

Road Operation *

D1 Lanes *

(auto-filled if in DB; editable when needed)

D2 Lanes *

(auto-filled if in DB; editable when needed)

Road Classification (Cap.) *

Physical per-lane capacity for V/C ratio denominator

Traffic Mix Controls (HV / RT)

HV (%) *

(auto-filled if in DB; editable when needed)

RTP (%) *

Directional Overrides (used only when DHVPA/DRTPA = Yes)

D1 HV% *

D2 HV% *

D1 RT% *

D2 RT% *

This updates directional summary, queue, VCR/LOS, optional diagnostics, and charts in one pass.

Grouped Directional Summary

Compares AM/OP/PM/EV directional splits and totals used by downstream queue and VCR calculations.

🔴 Direction 2, Against Gazettal

Year	AM			OP			PM			EV			Total
Year	LV	HV	RT	LV	HV	RT	LV	HV	RT	LV	HV	RT	Total

🟢 Direction 1, Gazettal

Year	AM			OP			PM			EV			Total
Year	LV	HV	RT	LV	HV	RT	LV	HV	RT	LV	HV	RT	Total

Queue Length EstimationAustroads AGTTM

Toggle between table and chart views. Stop/Go hold queues use zero-discharge accumulation (AGTM Part 3). Lane closure shows net overflow (open lane discharging at design capacity) as the primary figure, with worst-case zero-discharge as a footnote. AGTTM merge-taper checks are advisory for advance-warning placement — they do not inflate queue length.

Add custom duration standard rows stay 2 / 5 / 10 / 15 min

SLC for TGS sheet

🔴 Direction 2, Against Gazettal

Queue Duration	AM	OP	PM	EV	Max Queue

🟢 Direction 1, Gazettal

Queue Duration	AM	OP	PM	EV	Max Queue

🟠 SWT Queue Summary

Direction	AM	OP	PM	EV	Max SWT Queue

VCR / LOS AnalysisAustroads AGTM Pt 3

Tracks directional and network stress across periods using LOS color bands. Use this as primary capacity risk screening.

Work VCR assumes: Single Lane Closure (default)

🔴 Direction 2, Against Gazettal

Metric	AM	OP	PM	EV

🟢 Direction 1, Gazettal

Metric	AM	OP	PM	EV

* Design capacity uses Austroads/TMR practical per-lane capacity adjusted for terrain, geometry and HV/RT mix, with a minimum of 500 vph/lane.

HOURLY ESTIMATE

Bucket Definition: AM (07:00-09:00, MORNING PEAK), OP (09:00-16:00, MORNING OFF PEAK), PM (16:00-18:00, EVENING PEAK), EV (18:00-07:00, EVENING OFF PEAK).

Operation Type

⚠️ Use red time per cycle, NOT total hourly accumulation. Temporary work-zone stop/go commonly uses around 120s in a 240s cycle.

Max Back-of-Queue Calculator

Auto-filled from calculated VPD/hourly profile and direction settings.

Arrival Volume (vph, auto):

Effective Red Time (s, auto):

Saturation Flow (vph, auto):

Average Vehicle Spacing (m, auto):

Estimated Max Queue: --

1. QUEUE LENGTH (Hourly Basis)

Queue Wait Time

Direction 1

Hour	Hour Type	Volume (vph)	AGTTM Queue (m)	SWT Queue (m)	Max Physical Reach (m)

Direction 2

Hour	Hour Type	Volume (vph)	AGTTM Queue (m)	SWT Queue (m)	Max Physical Reach (m)

2. VCR (Hourly Basis)

Direction 1

Hour	Base VCR (LOS)	Work VCR (LOS)

Direction 2

Hour	Base VCR (LOS)	Work VCR (LOS)

Detour Route Capacity

Select a detour path, set road volumes and capacity, then review directional V/C and true extra delay. Multi-route scenarios, trip generation, and Excel capacity summary are all on this card.

How this works Closed / diverted demand → path or alternatives assignment → directional V/C (Excel summary: ROUNDUP(VPD×15%×80%)) → true extra delay. Scan streets, curate Base VPD weights, and confirm HV route suitability before adopting outputs.

Detour Route Scenarios

Configure how many detour routes need separate analysis. Each route keeps its own selected path, weights, and detour inputs.

1 route configured.

Diversion Rate (%)

Why 80% default? Leaves ~20% residual on the primary for local access / emergency traffic.

Suggested (soft): one-way ~80%, full closure ~90% — adjust for primary road class and site conditions.

Suggestions never overwrite automatically — click Apply, then edit freely.

Assignment Mode

Use Path when roads form one continuous detour. Use Alternatives when roads are competing parallel options.

Closure Type Heavy Vehicle Route Suitability Confirmed

Confirm bridge load limits, low-clearance structures, and swept-path suitability before adopting detour capacity outputs.

Nearby Street Name Finder

Select one or more streets to define the traffic detour path.

0.2 0.2 km

Selected path: -

Select a primary site/search, then scan.

Estimated Detour Delay Inputs

Detour Lane Width (m)

Lateral Clearance Each Side (m)

Topography / Grade Class

Road Classification (Capacity)

Physical per-lane capacity for V/C — same classes as the assessment form

Detour Length (km)

Normal (closed) route length (km)

Average Speed (km/h) — auto from road speeds

# Controlled Intersections

# Uncontrolled Intersections

Delay @ Controlled (s)

Delay @ Uncontrolled (s)

Estimated delay per diverted vehicle: -

Alternative Detour Analysis

Independent corrected analysis: pick your own path and road inputs below (or optionally import from the purple card). Engine: closed demand → assignment → directional V/C → true extra delay.

Alternative (corrected engine) Closed demand → assignment → directional V/C → true extra delay. Independent path and VPD from the purple card. Purple remains the rich path/weight workbench; this card is the smart/corrected analysis (class-aware Estimate defaults, adoption summary, report source selectable). After Copy purple inputs, numbers match until you change path, weights, or assignment.

Diversion Rate (%) Assignment Mode Closure Type

Closed Direction

Nearby Street Name Finder

Select streets to build this card's detour path (independent of the purple card).

0.2 0.2 km

Selected path: -

Select a primary site/search, then scan.

Delay & capacity inputs

No path selected yet — scan and click street chips above.

Detour length (km)

Normal / closed length (km)

Controlled intersections

Uncontrolled intersections

Delay @ controlled (s)

Delay @ uncontrolled (s)

Lane width (m)

Base lane capacity (vph)

Lateral clearance (m)

Grade class

Formula Trace

Analysis Assumptions

DTCA Path

HV Source

RT Source

Growth Source

Lane Source

Profile Source

Trace Item	Applied Value / Rule

Beta Features (Click to Expand)

Trial Features — Use for exploratory assessment only. Always validate outputs with independent manual engineering checks before reporting.

🔴 In Beta Features, editable input boxes are red and should be reviewed before use.

🟢 Auto-filled/read-only boxes are green. If a field is auto-filled but marked editable, you can still adjust it.

Intersection Queue & Capacity Calculator

Arrival Volume (vph)

Base Lane Capacity (vph)

Red Time (seconds)

Heavy Vehicles (%)

Posted Speed (km/h)

Volume/Capacity Ratio 0.83

Level of Service LOS D

Dynamic Spacing (m/veh) 7.25m

          Estimated Queue Length
          90.6m
        

💾 Multi-Stage Scenario Manager

Save your current calculated metrics as a distinct project stage (e.g., "Phase 1 - NB Lane Closed"). Build a comparison matrix for your final report.

Stage Name:

📐 AGTTM Layout Geometry & Cross-Section

Ref: Austroads AGRD Part 3 / AGTTM Part 3 (Static Work Sites)

Calculates minimum sign spacing (Dimension D) and taper lengths (Merge, Shift, Shoulder) required by AGTTM guidelines.

AGTTM COMPLIANT

Min 0.5m for urban, 2.0m for rural highway.

Distance to kerb/barrier (AGRD Part 3 Table 4.6). For worksite staging, also check AGTTM Part 3 Section 3.2.1 clearances (typically 1.2 m desirable, 0.3 m absolute minimum with approved barriers).

Sign Spacing (D)

Merge Taper (T)

Shift Taper (T/2)

Shoulder Taper

👁️ Approach Sight Distance (ASD)

Calculates the safe stopping distance required for approaching traffic based on speed, reaction time, and road gradient.

Reference note: Longitudinal deceleration friction factors (f) used in ASD braking-distance calculations are taken from Austroads AGRD Part 3, Table 5.2, General Case d (sealed road, passenger vehicle).

Reaction Dist.

Braking Dist.

Total Required ASD

🧠 Road Type Sensitivity (Quick Search)

Tune how the model classifies residential vs busy roads and applies traffic scaling in quick search estimates.

Residential Max Avg AADT

Busy Min Avg AADT

Residential Factor (%)

Mixed Factor (%)

Busy Factor (%)

📉 Speed Reduction Travel Time Impact

Calculates the baseline time penalty added to every vehicle passing through the work zone due to reduced speed limits, assuming free-flowing conditions (no queuing).

Added Delay Per Vehicle

Lost hours per day

💸 Economic Delay Cost (Road User Cost)

Calculates the estimated daily economic impact of the traffic delay using standard Austroads Value of Time (VoT) rates. Translates network delay hours into financial cost to the community/freight industry.

Total Daily Economic Cost to Community

LV: $0 | HV/RT: $0

Stop/Go Shuttle Simulator

Calculates signal timings and queues for single-lane reversible flow operations (portable traffic lights or Stop/Go). Based on the peak hourly volume of your selected profile.

D1 Green Time

Base Queue: -

Applied twice per cycle

D2 Green Time

Base Queue: -

🗺️ AustRoads Management Visualization

Select a generic temporary management template to visualize the work zone layout and estimated queue impact based on your calculated traffic volumes.

Management Template

Pedestrian Detour Impact

New Detour Route Name

Apply the same detour route to pedestrians?

0.2 0.2 km

Selected path: -

Scan map to choose pedestrian detour streets.

Estimated Delay - Detour route (-)

📏 Measure Distance (Google Maps) 📏 Measure Distance (MetroMaps)

Calculates estimated maximum pedestrian delay using route distances, walking speed, and controlled/uncontrolled crossing delays.

Estimated Maximum Added Delay

Existing time + detour time + crossing delay model

Existing Route Time (s)	Detoured Route Time (s)	Crossing Delay (s)	Added Delay (s)	Added Delay (min)
-	-	-	-	-