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Updated 8:00 AM EST, April 15, 2008
 Using Private Vendors for ESS Data Collection, RWIS Network Operation, or RWIS Network Maintenance
2004 National Summary
| Number of States Surveyed / Returned Survey | Number of States Using ESS | Total Number of ESS | Number of States Using Private Vendors for the Following Tasks |
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| ESS Data Collection | RWIS Network Operation | RWIS Network Maintenance |
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| 50 / 48 | 36 | 1407 | 18 | 15 | 18 |
2004 Statewide Summary
| State | Uses ESS | Number of ESS | Uses Private Vendors for the Following Tasks |
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| ESS Data Collection | RWIS Network Operation | RWIS Network Maintenance |
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| Alabama | No | 0 | No | No | No | | Alaska | Yes | 24 | Yes, Surface Systems Inc ESS polling sequence | Yes, Surface Systems Inc | Yes, Surface Systems Inc extended warranty | | Arizona | Yes | 14 | Yes, System Innovation | Yes, System Innovation | Yes, System Innovation | | Arkansas | No | 0 | No | No | No | | California | Yes | 81 | No | No | No | | Colorado | Yes | 80 | Yes, SSI, Inc. | Yes, SSI, Inc./CDOT/Colaorado State Telecommunications/Enroute Traffic Systems Inc. | Yes, SSI, Inc./CDOT/Enroute Traffic Systems Inc | | Connecticut | Yes | 6 | Yes, SSI | Yes, SSI | Yes, SSI/CONNDOT | | Delaware | Yes | N/R* | No | No | No | | Florida | Yes | 30 | Yes, University of North Florida | Yes, University of North Florida
FDOT District 5 ITS Office | Yes, University of North Florida | | Georgia | Yes | 47 | No | No | No | | Hawaii | No | 0 | No | No | No | | Idaho | Yes | 30 | No | No | No | | Illinois | N/R* | N/R* | N/R* | N/R* | N/R* | | Indiana | Yes | 31 | Yes, SSI | Yes, SSI | Yes, SSI | | Iowa | Yes | 53 | No | No | No | | Kansas | Yes | 43 | Yes, SSI designed and configured - KsDOT owned and operated. 17 sites KDOT LAN/WAN linked, 2 sites direct dial from server, 24 sites cell phone. | Yes, SSI designed, KsDOT owned, operated | Yes, SSI designed, KsDOT operated and maintained | | Kentucky | Yes | 7 | No | No | No | | Louisiana | Yes | 3 | No | No | No | | Maine | Yes | 5 | No | No | No | | Maryland | Yes | 60 | Yes, SSI | Yes, State and SSI | Yes, State | | Massachusetts | Yes | 11 | No | No | No | | Michigan | No | 0 | No | No | No | | Minnesota | Yes | 93 | No | Yes, We do most of our own maintenance, but occasionally contract with SSI for problems involving proprietary software or processes. | No | | Mississippi | N/R* | N/R* | N/R* | N/R* | N/R* | | Missouri | Yes | 15 | No | No | No | | Montana | Yes | 60 | Yes, SSI | Yes, SSI | Yes | | Nebraska | Yes | 45 | Yes, Surface Systems Inc. | Yes, ssi | Yes, ssi | | Nevada | Yes | 54 | No | No | Yes, Vaisala | | New Hampshire | Yes | 4 | Yes, Vaisala | Yes, Vaisala | Yes, Vaisala | | New Jersey | No | 0 | No | No | No | | New Mexico | No | 0 | No | No | No | | New York | No | 0 | No | No | No | | North Carolina | No | 0 | No | No | No | | North Dakota | Yes | 19 | No | No | No | | Ohio | Yes | 158 | Yes, Quixote | No | No | | Oklahoma | No | 0 | No | No | No | | Oregon | Yes | 55 | No | No | No | | Pennsylvania | Yes | 4 | Yes, Intellimark | Yes, SSI, Numterics and Boschung | Yes, SSI, Numterics and Boschung | | Rhode Island | Yes | 8 | Yes, SSI | No | Yes, SSI | | South Carolina | Yes | 19 | Yes, Surface Systems Inc. | No | No | | South Dakota | Yes | 40 | Yes, Meridian Environmental Technology
Grand Forks, ND | No | No | | Tennessee | Yes | 37 | No | No | Yes, Vaisala, Inc.
SSI | | Texas | No | 0 | No | No | No | | Utah | Yes | 41 | No | No | No | | Vermont | No | 0 | No | No | No | | Virginia | Yes | 66 | Yes, Surface Systems Inc. | Yes, Surface Sytems Inc. and VDOT | Yes, Surface Sytems Inc. and VDOT | | Washington State | Yes | 76 | No | No | Yes, Sruface Systems, Inc. is currently maintaining the server system. (Will likely change this summer). | | West Virginia | No | 0 | No | No | No | | Wisconsin | Yes | 60 | Yes, SSI | Yes, SSI | Yes, SSI | | Wyoming | Yes | 28 | No | No | No | | 50 States * N/R = No response |
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