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The Sensys™ Wireless Vehicle Detection System

Advanced Technology For 21st Century Traffic Management

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AgendaAgenda

• Introduction

• Technology

• Components

• Accuracy

• Conclusion

An introduction to the Sensys Wireless Vehicle Detection System

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The SensysThe Sensys™ Wireless Vehicle Detection System™ Wireless Vehicle Detection SystemThe next generation of vehicle detection technology

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• Freeway/arterial monitoring

• Freeway ramp management

• Traffic signal control (intersection management)– Stop bar detection– Advance detection

(traffic calming; dilemma zone protection)– Adaptive traffic signal control

• Planning & asset management

• Traveler information systems

ApplicationsApplications

Vehicle detection solutions for traffic monitoring & management

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TechnologyTechnology

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Breakthrough TechnologyBreakthrough Technology

NEW GENERATIONNEW GENERATIONOF POWERFULOF POWERFUL

RF CHIPSRF CHIPS

NEW GENERATIONNEW GENERATIONOF HIGHLY INTEGRATEDOF HIGHLY INTEGRATED

SENSORSSENSORS

PATENT-PENDING SENSYS PATENT-PENDING SENSYS NETWORKSNETWORKS

TECHNOLOGIESTECHNOLOGIES

• Low-power networking

• Low-power circuitry

• Reliable radio comms

• Signal processing

• Mechanical design

• 10-year battery life

• Installs in less than 10 minutes

• Self-calibrates & self-configures

• Individually addressable

• Firmware upgrades over-the-air

SMART IN-PAVEMENTSMART IN-PAVEMENTWIRELESS SENSORWIRELESS SENSOR

Sensys has innovated a new vehicle detection solution

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Standards-Based Radio CommunicationsStandards-Based Radio Communications

• IEEE 802.15.4 PHY – used by ZigBee and other wireless systems– Data rate of 250 kbps used by Sensys– 16 frequency channels in the 2.4 GHz ISM band

• Sensys NanoPower (SNP) protocol – Operates on top of 802.15.4 PHY as Media Access Protocol (MAC)– TDMA scheme allocates time slots for each sensor’s transmission– Access point acknowledges reception; each sensor re-transmits data is

unacknowledged

Sensys has adopted standard radio technology

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Magnetometer-Based Vehicle DetectionMagnetometer-Based Vehicle Detection

source: Honeywell

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Fast & Easy InstallationFast & Easy Installation

• Each flush-mount sensor is installed using a hammer drill or core drill – 4” / 10 cm diameter hole– 2 ½” / 6 cm deep – Covered with fast-drying epoxy

• Less than 10 minutes install time per sensor

• Minimal lane closure time

Fast Installation = Less $$$

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A Complete Integrated Solution for Traffic DataA Complete Integrated Solution for Traffic Data

Detection, data relay, data processing, and network management

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A Wealth of Detection DataA Wealth of Detection Data

• Volume

• Speed

• Occupancy

• Presence

• Gap

• Headway

• Length classification

• Queue length

Vehicle detection data for any application

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Compatibility with Current & New InfrastructuresCompatibility with Current & New Infrastructures

• Roadside traffic controllers

• Current and future Traffic Management Center(s) via native IP

• Simultaneous data routing to traffic controller and Traffic Management Center, as desired

• Inductive loops and other deployed detection technologies– Same logical connections used by inductive loops can be used by

Sensys wireless sensors– Broken detectors can be replaced with Sensys wireless sensors,

operating alongside existing detection technologies

Maximize legacy investment with future-proof technology

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ComponentsComponents

Access Point RepeaterFlush-Mount Wireless Sensor

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Flush-Mount Wireless SensorsFlush-Mount Wireless Sensors

• Installs in small hole using hammer or core drill in less than 10 minutes

• Rugged mechanical design

• 10 years of battery life

• Auto-calibration

• Reliable 2-way radio comms to access point – uniquely addressable

In-pavement sensors provide detection exactly where needed

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Sensys Access PointSensys Access Point

• Installs in minutes

• No calibration or adjustment required

• Processes, stores, and/or relays sensor data (Linux OS)– Contact closure to traffic controller– IP (fiber or cellular) to central

servers

• Supports as many sensors as necessary

• Can serve as IP router for peripherals (video cams, etc.)

Access point relays sensor data to traffic controller or central servers

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Sensys RepeaterSensys Repeater

• Battery-powered unit

• Supports up to 10 wireless sensors

• Relays detection data back to access point, extending range

• Supports mid-block detection – no trenching required

Repeater relays sensor data to access point

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Radio RangesRadio Ranges

Ranges will increase with new radio designs (Summer 2007)

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Multiple Data InterfacesMultiple Data Interfaces

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Vehicle detection data delivered as needed

• Contact closure interface to

roadside traffic controller– Type 170– NEMA TS1– NEMA TS2– Type 2070 ATC

• IP connectivity to ITS facilities – Traffic Management Centers,

Traveler Information Systems, etc.

– Wired or wireless connectivity

• Simultaneous connectivity to both, as required

wired or wireless IP connectivity

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AccuracyAccuracy

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Representative Count AccuracyRepresentative Count Accuracy

source: CCIT, “Innovative Transportation Products and Services: Evaluation of Wireless Traffic Sensors,” Final Report, October 2006.

CCIT study: I-80; Emeryville, CA; Oct 2006

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Representative Speed AccuracyRepresentative Speed AccuracyCCIT study: I-80; Emeryville, CA; Oct 2006

source: CCIT, “Innovative Transportation Products and Services: Evaluation of Wireless Traffic Sensors,” Final Report, October 2006.

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ConclusionConclusion

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New Loops or New Sensys Wireless Sensors?New Loops or New Sensys Wireless Sensors?

• Side-by-side installation in Scottsdale, AZ (Loop 101)

• Sensys installed in 1/10th the time

• Sensys installed with 1/4th the crew

• Sensys tested to be just as accurate as loops (but with better reliability)

Sensys wireless sensors

inductive loops

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Sensys AdvantagesSensys Advantages

• Flexible technology – one platform for all vehicle detection needs

• High accuracy – comparable to well-maintained inductive loops…

• Superior reliability – …but without the problems of loops

• Low life-cycle cost – simple installation, long operational lifetime

The Sensys Wireless Vehicle Detection System is the smart choice

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Sensys @ ITS America – Please visit us at Booth #534 to learn more!