Incident Detection for Road Traffic Management

TS91 “Incident Detection for Road Traffic Management”
Idris is the recognized brand for a collection of patented vehicle detection and classification products developed by Diamond Consulting Services Limited of Aylesbury, England.

Idris has many applications in the Intelligent Traffic Systems industry, but has achieved much success in tolling, where it has arguably become the de facto standard for axle-based vehicle classification in Open Road Tolling (ORT/MLFF).

Idris is now being applied to Automatic Incident Detection to help road operators achieve their objectives in road safety through high accuracy and low false alarm rates.

Idris

Started as Incident Detection system, in UK, 1995
Single sensor, multi-lane, loop-based vehicle detection
Count accuracy improved 100-fold
>99.99% in free flow
Has become the de facto standard in axle-based ORT
Counts axles & classifies accurately in all conditions
Low cost of ownership
High MTBF; long lifetime; no post or gantry issues
Has won 2 Queens’ Awards for Enterprise
Export 2006; Innovation 2008
Now returning to improve Incident Detection

How Idris Automatic Incident Detection (AID) works

Diagram to show how Idris Automatic Incident Detection (AID) works

Features of Idris AID
Idris AID relies fundamentally on its unique core ability to detect and profile vehicles. Idris has a proven track record in measuring the length, speed and type of vehicle as it passes. Idris can discriminate between tailgating vehicles and those with trailers.

The Idris profiling engine provides a wealth of data relating to each vehicle which allows the incident detection supervisor program to accurately match vehicle records at each outstation and hence track the vehicle along the roadway.

Vehicles that either stop or perform erratically are immediately identified to the control centre, as are conditions general to the traffic flow.

Software architecture

Diagram of an Idris Incident Detection Processor

Event alarms

Slow Traffic
Single Stopped Vehicle (SSV)
Queued Traffic
Parked Vehicle (Shoulder or ERA)
Slow Vehicle
Reversing Vehicle

Performance

Length repeatability:	Mean = 1cm Std Dev = 7cm
Speed accuracy:	99%
Re-identification of vehicle at next outstation:	>99.5% (flowing traffic)
Single Stopped Vehicles:	Detection rate =>90% False Alarms = <10%

SSV Detection works in flow rates up to 2000 vehicles / hour / lane

And there’s more…….

Traffic counts (Time, Lane, Exit)
Traffic flows
Average speed (Time, Lane)
Traffic patterns
Individual vehicle data

Idris AID applications

Stand-alone
Rural highways and roads
Semi-urban motorways

Linked to CCTV
Tunnels & Bridges
Urban motorways

Idris AID
Tracks vehicles, detects problems
Day & Night, in any weather

Alerts control centre & CCTV
Trigger lane management, VMS

Use it stand-alone or with computer-aided CCTV

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