WO2002101340A3 - System for automated determination of retroreflectivity of road signs and other reflective objects - Google Patents

System for automated determination of retroreflectivity of road signs and other reflective objects Download PDF

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Publication number
WO2002101340A3
WO2002101340A3 PCT/US2002/017914 US0217914W WO02101340A3 WO 2002101340 A3 WO2002101340 A3 WO 2002101340A3 US 0217914 W US0217914 W US 0217914W WO 02101340 A3 WO02101340 A3 WO 02101340A3
Authority
WO
WIPO (PCT)
Prior art keywords
retroreflectivity
roadway
values
reflective surface
along
Prior art date
Application number
PCT/US2002/017914
Other languages
French (fr)
Other versions
WO2002101340A2 (en
Inventor
James E Retterath
Robert A Laumeyer
Original Assignee
Facet Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Facet Technology Corp filed Critical Facet Technology Corp
Priority to AU2002305854A priority Critical patent/AU2002305854A1/en
Publication of WO2002101340A2 publication Critical patent/WO2002101340A2/en
Publication of WO2002101340A3 publication Critical patent/WO2002101340A3/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096758—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where no selection takes place on the transmitted or the received information
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096791—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is another vehicle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N2021/551—Retroreflectance

Abstract

A system for the automated determination of retroreflectivity values for reflective surfaces disposed along a roadway repeatedly illuminates an area along the roadway that includes at least one reflective surface using a strobing light source. Multiple light intensity values are measured over a field of view which includes at least a portion of the area illuminated by the light source. A computer processing system is used to identifying a portion of the light intensity values associated with a reflective surface and analyze the portion of the light intensity values to determine at least one retroreflectivity value for that reflective surface. Preferably, color images of the area and locational information are also generated by the system and are used together with a characterization profile of the light source to enhance the accuracy of the determination of retroreflectivity values. In one embodiment, a three-dimensional overlay of retroreflectivity values for the roadway is generated and can be manipulated to display retroreflectivity values of a reflective surface at any desired point along the roadway. In another embodiment, a virtual drive through along a roadway is simulated using a plurality of retroreflectivity values to simulate reflections from each reflective surface disposed along the roadway during the virtual drive through.
PCT/US2002/017914 2001-06-07 2002-06-05 System for automated determination of retroreflectivity of road signs and other reflective objects WO2002101340A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002305854A AU2002305854A1 (en) 2001-06-07 2002-06-05 System for automated determination of retroreflectivity of road signs and other reflective objects

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US29659601P 2001-06-07 2001-06-07
US60/296,596 2001-06-07
US09/918,375 2001-07-24
US09/918,375 US6674878B2 (en) 2001-06-07 2001-07-30 System for automated determination of retroreflectivity of road signs and other reflective objects

Publications (2)

Publication Number Publication Date
WO2002101340A2 WO2002101340A2 (en) 2002-12-19
WO2002101340A3 true WO2002101340A3 (en) 2003-04-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/017914 WO2002101340A2 (en) 2001-06-07 2002-06-05 System for automated determination of retroreflectivity of road signs and other reflective objects

Country Status (3)

Country Link
US (4) US6674878B2 (en)
AU (1) AU2002305854A1 (en)
WO (1) WO2002101340A2 (en)

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Also Published As

Publication number Publication date
US20020186865A1 (en) 2002-12-12
US7173707B2 (en) 2007-02-06
US20070216904A1 (en) 2007-09-20
US20060262312A1 (en) 2006-11-23
AU2002305854A1 (en) 2002-12-23
US7043057B2 (en) 2006-05-09
US20040156531A1 (en) 2004-08-12
WO2002101340A2 (en) 2002-12-19
US7411681B2 (en) 2008-08-12
US6674878B2 (en) 2004-01-06

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