Service Limits

The Limits Configuration service allows you to define speed and weight thresholds for traffic analysis. When combined with speed estimation and vehicle classification, AITracker can identify vehicles that exceed these limits and generate statistical reports.

Overview

This service is designed for traffic studies and analysis - not for law enforcement. It provides valuable insights into:

• Speed compliance patterns

• Heavy vehicle traffic analysis

• Traffic safety assessments

• Before/after studies for road changes

⚠️ Important Disclaimer: Speed values are estimations based on trajectory analysis and homography transformation. Weight values are estimated based on vehicle category (not actual weighing). This data is not certified for legal enforcement or issuing fines/penalties.

Configuration

Limits Configuration

Speed and weight limits are configured in the VelocityConfig section of your scene configuration:

Parameter	Type	Unit	Description
day	float	km/h	Speed limit for daytime hours (05:00-22:00)
night	float	km/h	Speed limit for nighttime hours (22:00-05:00)
weight	float	kg	Maximum allowed vehicle weight

Time Periods

The system automatically distinguishes between:

• Day period: 05:00 - 22:00 (uses day speed limit)

• Night period: 22:00 - 05:00 (uses night speed limit)

This allows for different speed limits during nighttime, which is common on many roads.

Speed Exceedance Detection

For each vehicle passing through the measurement zone:

1. Speed is calculated based on time spent in the zone

2. Current time determines which limit applies (day/night)

3. Vehicle is flagged as VelocityExceeded = True if speed > limit

Weight Limit Analysis

How Weight Is Estimated

Vehicle weight is not measured directly - it is estimated based on vehicle category:

Vehicle Category	Estimated Weight
Motorcycle	~200 kg
Passenger car	~1,500 kg
Delivery van	~2,500 kg
Light truck	~7,500 kg
Medium truck	~12,000 kg
Heavy truck	~26,000 kg
Articulated truck	~40,000 kg
Bus	~15,000 kg

Note: These are typical category weights. Actual vehicle weights may vary significantly. This is suitable only for statistical analysis.

Weight Exceedance Detection

The system flags vehicles as WeightExceeded = True when:

• Vehicle category's estimated weight > configured weight limit

This is useful for identifying heavy vehicle traffic patterns on roads with weight restrictions.

Weight Analysis Limitations

Aspect	Description
Method	Category-based estimation (not actual weighing)
Accuracy	Approximate (based on vehicle type, not actual load)
Certification	❌ Not suitable for enforcement

Generated Reports

OffensesSpeed.png

Hourly chart showing:

• Number of vehicles within speed limit

• Number of vehicles exceeding speed limit

OffensesWeight.png

Hourly chart showing:

• Number of vehicles within weight limit

• Number of vehicles exceeding weight limit

Report.docx

The generated report includes:

Speed Limit Section

• Total vehicles analyzed

• Percentage of vehicles exceeding speed limit

• Day/night breakdown of exceedances

• Exceedances by direction

• Exceedances by vehicle category

Weight Limit Section

• Total vehicles analyzed

• Percentage of vehicles exceeding weight limit

• Breakdown by direction

• Heavy vehicle traffic patterns

Special Vehicles Detection

The system also identifies special vehicles (emergency, military, government) based on license plate patterns and reports them separately.