Darcy_Bullock_Indiana_Virtual_Weigh_Station.ppt - Purdue University by xuyuzhu

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									Enforcement Procedures Using
Weigh-in-Motion Systems in
Indiana
Darcy Bullock, P.E.   Purdue University
Andrew Nichols        Purdue University
Lt. Guy Boruff        Indiana State Police
Mark Newland          INDOT
Jason Wasson, P.E.    INDOT
Presentation Perspective
  This presentation is going to cover the
  Indiana Virtual Weigh Station.
  We put this presentation forth to
  stimulate discussion that may lead to a
  consensus straw man for deploying
  additional sites along the GCM corridor
  in Illinois and Wisconsin
Virtual Weigh Station Project
  Virtual Weigh Station Project initiated by
  INDOT and Purdue in 2000
  Objective: ISP Commercial Vehicle
  Enforcement mobile units can pull up to WIM
  site and connect wirelessly to cabinet to see
  real-time truck weight data
  The WIM reading is used to screen vehicles
  to be pulled over and weighed with certified
  portable scales
Background
 INDOT currently has ~42 installed WIM sites
 WIMs originally installed as Strategic Highway
 Research Project and Long Term Pavement
 Performance Project sites to collect
 continuous vehicle data to be used for
 research, design and planning
 Indiana State Police wanted a method for
 using the WIMs for dynamic weight limit
 enforcement efforts
                 I 80/94 – Day of Week       Borman WIM Eastbound
                                             Average Class 9 Volume
                                                 with GVW > 80k

                       Eastbound WIM Class 9 Volume GVW > 80k
                                          January, February, March 2002


                1400
                             January 16 – March 31, 2002
                              EB
                1200



                1000
Average Count




                800



                600



                400



                200



                  0
                       Sunday   Monday   Tuesday         Wednesday          Thursday   Friday   Saturday

                                                   January   February   March
                 I 80/94 – Hour of Day                                           Borman WIM Eastbound
                                                                                 Average Class 9 Volume
                                                                                     with GVW > 80k

                               Eastbound WIM Class 9 Volume GVW > 80k         January, February, March 2002


                60
                                     January 16 – March 31, 2002
                                      EB
                50



                40
Average Count




                30



                20



                10



                0
                     0:00

                            1:00

                                   2:00

                                          3:00

                                                 4:00

                                                        5:00

                                                               6:00

                                                                      7:00

                                                                             8:00

                                                                                    9:00

                                                                                           10:00

                                                                                                     11:00

                                                                                                             12:00

                                                                                                                     13:00

                                                                                                                             14:00

                                                                                                                                     15:00

                                                                                                                                             16:00

                                                                                                                                                     17:00

                                                                                                                                                             18:00

                                                                                                                                                                     19:00

                                                                                                                                                                             20:00

                                                                                                                                                                                     21:00

                                                                                                                                                                                             22:00

                                                                                                                                                                                                     23:00
                                                                                                   Time of Day

                                                                                       January         February         March
First Pilot run, observers standing
in bushes radioing weights
downstream manually




     August 10, 2000
     WIM Reading 112,340
     Portable Scales 111,350
     Legal ~73,280 (short trailer)
I-65 WIM @ Merrillville
 I-65 WIM @ Merrillville

                           N



Sensors




                               close-up
Single Load Cell WIM
       Speed  Upstream Loop and Downstream Loop
       Axle Spacing  Piezoelectric strip detects axles
       Weight  Load cell for each wheel
                                      I-65

                        4    5    6          3   2   1      N

Upstream Loop

  Load Cells
     Piezo                                                  
                                                           
                                                             
                                                          

Downstream
   Loop
  I-65 WIM @ Merrillville




                            Antenna
Equipment
Cabinet
Merrillville WIM Cabinet
                 •2 PCs in equipment cabinet
                 •1 for NB system
                 •1 for SB system


               Modem
               Panel
VWS Field Installed Hardware
                               Modem Panel
                               Mounted inside cabinet




 Antenna
 Mounted adjacent to cabinet
VWS Data Flow

            90,000 lb
VWS Vehicle Hardware
The cables, antenna, and modem fit inside the portable
case to protect equipment when not being used.
   VWS Vehicle Hardware
                          Protective
                          case holds
                          modem and
                          antenna can
                          be passed
Laptop                    from car to
located in                car
police
cruiser                   900 Mhz
with                      radio
software                  modem
installed

                          MagMount
                          Antenna
   ISP/CVED Vehicle Setup
                            Printer




                             CB
Laptop
Docking
Station
  VWS Software

Data for
last
vehicle
crossing
WIM
                 Violator
                 Data
Summary
data for
all
vehicles
crossing
WIM
while
software
is active
Virtual Weigh Station Video
Virtual Weigh Station Video
Current Status
  Radio equipment currently installed in 2
  INDOT WIM cabinets
     I-65 Merrillville
     US 24 Fort Wayne
  ISP has 4 radio units to use during
  enforcement efforts
SR 24 WIM @ Ft Wayne
SR 24 WIM @ Ft Wayne



         SR 24

            WIM

                       Cabinet
SR 24 WIM @ Ft Wayne




            Truck Pulloff Area
Certified Portable Scales
             SR 24 WIM @ Ft Wayne Data      SR 24 WIM @ Fort Wayne
                                               Westbound Traffic

             100000                        Westbound WIM
             95000
                                                     Over GVW & Axle $1189

                         Over GVW & Tandem $1169
             90000

                                 Over GVW & Tandem $1099
             85000
Actual GVW




                                   Warning Over GVW
             80000



             75000



             70000



             65000



             60000
                 60000   65000     70000     75000       80000       85000   90000   95000   100000

                                                       WIM GVW
             SR 24 WIM @ Ft Wayne Data    SR 24 WIM @ Fort Wayne
                                             Eastbound Traffic

             100000                      Eastbound WIM
             95000



             90000



             85000
Actual GVW




                                  Warning Over GVW                          Over Tandem $129
             80000



             75000
                                          Warning Over Axle


             70000



             65000



             60000
                 60000   65000   70000     75000      80000        85000   90000   95000   100000

                                                   WIM GVW
I-65 WIM @ Merrillville Data
                              Combined Results Comparison of Weight Data
                        130,000
 Scale Weight in Lbs.




                        120,000

                        110,000

                        100,000

                         90,000

                         80,000

                         70,000

                         60,000
                              60,000   70,000   80,000   90,000   100,000   110,000   120,000   130,000

                                                   WIM Weight in Lbs.
I-74 WIM @ Covington Data
                                    Comparison of Weight Data

                          100,000
                           90,000
    Scale Weight in Lbs




                           80,000
                           70,000
                           60,000
                           50,000
                           40,000
                           30,000
                           20,000
                           10,000
                                0




                                                                                                                         100,000
                                    0

                                        10,000

                                                 20,000

                                                          30,000

                                                                   40,000

                                                                            50,000

                                                                                     60,000

                                                                                              70,000

                                                                                                       80,000

                                                                                                                90,000
                                                           WIM Weight in Lbs
VWS Photo WIM in Dover, IN
  Joint effort between ISP, INDOT, Mettler-
  Toledo and Purdue
  First Mettler-Toledo system used by us
  (others are by IRD)
  Installed on SR 1 in southeast Indiana – 2
  lane road with high truck volumes between I-
  74 & I-275
  Objective – record picture of overweight truck
  at WIM and transmit image to vehicle parked
  down stream
SR 1 Photo WIM @ Dover
SR 1 Photo WIM @ Dover




  N
SR 1 Photo WIM Pictures

                       2nd Picture
                     Shows USDOT #




     1st Picture
   Shows Violation
SR 1 Photo WIM Overlay
USDOT Number
SR 1 Performance (Nov 11,02)
 Total Sample 05:30:00 to 17:00:00      230   100.0%
    Images during Non-Daylight           42    18.3%
    Usable Images                       188    81.7%
        Mis-classified 2-Axle Vehicle    44    23.4%
        USDOT # Not in Frame             23    12.2%
        USDOT # Visible                 121    64.4%
           Legible                       79    65.3%
           Illegible                     42    34.7%
               Image Darkness            27    64.3%
               Font Color Contrast        8    19.0%
               Font Size                  5    11.9%
               Image Blurriness           2     4.8%
SR 1 Status
  Strong support of the project by Mettler-Toledo to
  develop prototype image capturing capability.
  Site is currently not lighted, lighting would obviously
  improve performance but that perhaps could lead to
  some issues with adjacent residents.
  These performance figures reported are very
  promising, but should only be viewed as work in
  progress and will likely significantly improve in the
  coming months.
  This is not analogous to red-light cameras as these
  weights are not appropriate for enforcement.
Overall Project Status
  When using WIM for enforcement, enforcement
  personnel desire more accuracy then traditional
  required for performance monitoring.
  Purdue is logging data from all Indiana WIM sites
  and conducting large scale analysis of SQL database
  (several million records/month)
  In the process of creating online reports on various
  sites for ISP enforcement scheduling purposes
  Developing Statistical Process Control procedures for
  detecting calibration drift and other equipment errors
  sooner.
QC – Difference in Tandem
Axle Weights
  Difference between closely spaced
  tandem axles
  For Class 9, 2nd and 3rd OR 4th and 5th
  axles
QC – Tandem Axle Spacing
  Spacing of tandem axles
  For Class 9, 2nd and 3rd OR 4th and 5th
  axles
  2nd and 3rd axle spacing have very low
  variation
Virtual Weigh Station Video
Questions
         Darcy Bullock, P.E.
              Professor
          Purdue University
      School of Civil Engineering
      West Lafayette, IN 47907
            765 494 2226
         darcy@purdue.edu

								
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