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TRANSCRIPT
Overview: Vehicle Detection & Measurement Technologieseasu e e t ec o og es
Why do you need Traffic Sensors at all? Alternative Sensors and Why? Alternative Sensors and Why?
In-Roadway On-Roadway Over Roadway Over-Roadway
Sensor Technology Comparison In-Roadway
Pneumatic Tube Pneumatic Tube Inductive Loop Magnetic Sensors
On-Roadway On Roadway Pneumatic Tube NC-200
Over-Roadwayy SDR Radar-G4
Fount of All Traffic KnowledgeFount of All Traffic Knowledge
FHWA Traffic Detector Handbook:FHWA Traffic Detector Handbook: Third Edition – Volume I
Everything you wanted to know but were afraid to ask.
Why do we need sensors at all?
Vehicle Counts Vehicle Counts
Road Maintenance & Speed Monitoring
Congestion Evaluation New Route Congestion Evaluation – New Route Creation – Maintenance Costs
Volume, Speed, Occupancy, Vehicle Classification, HeadwayVehicle Classification, Headway
Magnetic Sensors Changes in magnetic field trigger counts
Vehicle counts, speed, classification
Less susceptible than loops to traffic & Less susceptible than loops to traffic & temp – Insensitive to weather such as snow rain & fogsnow, rain & fog
Installation requires pavement cuts or boring under roadway – can not detect stopped vehicles – Requiresdetect stopped vehicles Requires lane closures for installation
Inductive Loop Detectors Changing loop inductance sends signal to traffic controller Changing loop inductance sends signal to traffic controller
Most Common Sensor used in traffic management
Mature well understood Technology – large experience base – provides basic traffic parameters
Installation requires pavement cuts – Improper installation
fdecreases pavement life –Installation and maintenance requires lane closures Wirerequires lane closures – Wire loops subject to stresses of traffic and temperature –traffic and temperature Multiple loops usually required to monitor a specific location
Pneumatic Road Tube Bursts of air pressure close
air switch to count trafficair switch to count traffic.
Temporary Traffic Counting
Quick installation for temporary countstemporary counts
Inaccurate Axel Counts –Temperature SensitivityTemperature Sensitivity –Vandalism – Truck Tire Wear – Traffic Control NeededTraffic Control Needed
Infrared SensorsI f d fl d f hi l i f d Infrared energy reflected from vehicles is focused on an optical sensing system
For Presence Detection – Volume - Speed Measurements – Classification
Does not require in-pavement installation –accurate measurement of vehicle position speed p pand classification
Relatively short operating Relatively short operating range – Performance degraded by inclement weather or directby inclement weather or direct sunlight
Ultrasonic Sensorsf Transmit pressure waves of sound above Human
auditable range Presence Detection - Speed Calculations –
Doppler Affect Does not require in-pavement
installation – Accurate measurement of vehicle position speed and classificationspeed and classification
Temperature change and air turbulence degradeturbulence degrade performance
Why Radar does a Great JobWhy Radar does a Great Job.
Non Intrusive: out of roadway Non Intrusive: out of roadway Installation safety Zero set back Not affected by weathery Solar power option Gathers all variety of data Gathers all variety of data Bluetooth data download
Value For Lean Times
Go cabinet freeBluetooth communication
ioption.Compare the costs…All-in-one…no add-on costsSolar or AC Zero Set Back No Cabinet TrainingData Collection
Solar Power Where There’s No AC
RTMS slashes power costs by 3- Only 3 watts
Smaller Solar Panels- Smaller Solar Panels- Cloudy Days No Problem!
RTMS covers both sides of the highway with one unit – others make you buy two.
Two extra lanes of coverage per sensor enable future growth without future cost: That’s value!
G4 : The Latest Traffic Detection Technology
Non Intrusive Non Intrusive Cost Effective Solar or AC All the Traffic Data You’ll Ever Need
Wrong Way DetectionWrong Way DetectionWARNING SIGN
RTMS
RTMS
WRONGWAY
NEWSHUB
WARNINGSIGN
DETECTIONZONE
G4 : The Latest Traffic Detection Technology
Non Intrusive Non Intrusive Cost Effective Solar or AC All the Traffic Data You’ll Ever Need
Summary: Vehicle Detection and Measurement Technologieseasu e e t ec o og es
Why do you need Traffic Sensors at all? Alternative Sensors and Why?y
In-Roadway On-Roadway Over-Roadway Over Roadway
Sensor Technology Comparison In-Roadway
Inductive Loop Inductive Loop Magnetic Sensors
On-Roadway Pneumatic Tube NC - 200
Over-Roadway SDR
RTMS G4 Microwave Radar