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Updated 8:00 AM EST, April 15, 2008
 Freeway Incident Detection and Verification Via Call Boxes
2006 National Summary
| Metropolitan Areas Surveyed / Returned Survey | Metropolitan Areas with Freeway Miles Covered by Call Boxes | Number of Freeway Miles |
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| Covered by Call Boxes | Total | Percent |
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| 106 / 100 | 30 | 2238 | 19370 | 12% |
2006 Metropolitan Summary
| Metropolitan Area | State | Number of Agencies Surveyed / Returned Survey | Agencies with Freeway Miles Covered by Call Boxes | Number of Freeway Miles |
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| Covered by Call Boxes | Total | Percent |
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| Albany, Schenectady, Troy | NY | 2 / 1 | 0 | 0 | 142 | 0% | | Albuquerque | NM | 1 / 1 | 0 | N/R* | 100 | N/R* | | Allentown, Bethlehem, Easton | PA | 2 / 2 | 1 | 26 | 60 | 43% | | Asheville | NC | 1 / 1 | 0 | 0 | 60 | 0% | | Atlanta | GA | 1 / 1 | 1 | 21 | 342 | 6% | | Austin | TX | 1 / 1 | 0 | 0 | 97 | 0% | | Bakersfield | CA | 1 / 1 | 1 | 30 | 175 | 17% | | Baltimore | MD | 1 / 1 | 0 | 0 | 373 | 0% | | Baton Rouge | LA | 1 / 1 | 0 | N/R* | 31 | N/R* | | Beaumont-Port Arthur | TX | 1 / 1 | 0 | 0 | 59 | 0% | | Bellingham | WA | 1 / 1 | 0 | 0 | 34 | 0% | | Birmingham | AL | 1 / 1 | 0 | 0 | 154 | 0% | | Boise City | ID | 1 / 1 | 0 | 0 | 36 | 0% | | Boston, Lawrence, Salem | MA | 1 / 1 | 1 | 394 | 394 | 100% | | Buffalo, Niagara Falls | NY | 2 / 1 | 0 | 0 | 145 | 0% | | Charleston | SC | 1 / 1 | 0 | 0 | 47 | 0% | | Charlotte, Gastonia, Rock Hill | NC | 2 / 2 | 0 | 0 | 101 | 0% | | Chattanooga | TN | 1 / 1 | 0 | N/R* | 70 | N/R* | | Chicago, Gary, Lake County | IL | 3 / 3 | 0 | 0 | 676 | 0% | | Cincinnati, Hamilton | OH | 1 / 1 | 0 | 0 | 234 | 0% | | Cleveland, Akron, Lorain | OH | 3 / 3 | 0 | 0 | 279 | 0% | | Columbia | SC | 1 / 1 | 0 | 0 | 125 | 0% | | Columbus | OH | 1 / 1 | 0 | N/R* | 172 | N/R* | | Dallas, Fort Worth | TX | 2 / 2 | 0 | 0 | 678 | 0% | | Dayton, Springfield | OH | 1 / 0 | 0 | N/R* | 154 | N/R* | | Daytona Beach | FL | 1 / 1 | 1 | 30 | 74 | 41% | | Denver, Boulder | CO | 1 / 1 | 0 | N/R* | 341 | N/R* | | Des Moines | IA | 1 / 1 | 0 | 0 | 61 | 0% | | Detroit, Ann Arbor | MI | 1 / 1 | 0 | 0 | 462 | 0% | | El Paso | TX | 1 / 1 | 0 | 0 | 104 | 0% | | Eugene | OR | 1 / 1 | 0 | 0 | 61 | 0% | | Fort Myers | FL | 1 / 1 | 1 | 34 | 34 | 100% | | Fort Wayne | IN | 1 / 1 | 0 | 0 | 62 | 0% | | Fresno | CA | 1 / 1 | 1 | 3 | 104 | 3% | | Grand Rapids | MI | 1 / 1 | 0 | 0 | 82 | 0% | | Greensboro, Winston-Salem, High Point | NC | 2 / 2 | 0 | 0 | 157 | 0% | | Greenville | NC | 1 / 1 | 0 | 0 | 0 | 0% | | Greenville, Spartanburg | SC | 1 / 1 | 0 | N/R* | 63 | N/R* | | Hampton Roads | VA | 1 / 1 | 0 | 0 | 161 | 0% | | Harrisburg, Lebanon, Carlisle | PA | 2 / 2 | 1 | 63 | 112 | 56% | | Hartford, New Britain, Middletown | CT | 1 / 1 | 0 | 0 | 191 | 0% | | Honolulu | HI | 1 / 1 | 1 | 68 | 77 | 88% | | Houston, Galveston, Brazoria | TX | 1 / 1 | 0 | N/R* | 577 | N/R* | | Huntsville | AL | 1 / 1 | 0 | 0 | 21 | 0% | | Indianapolis | IN | 1 / 1 | 0 | 0 | 154 | 0% | | Jackson | MS | 1 / 0 | 0 | N/R* | 128 | N/R* | | Jacksonville | FL | 1 / 1 | 0 | 0 | 160 | 0% | | Janesville-Beloit | WI | 1 / 1 | 0 | 0 | 39 | 0% | | Kansas City | MO | 2 / 2 | 0 | 0 | 416 | 0% | | Knoxville | TN | 1 / 1 | 0 | 0 | 71 | 0% | | Lancaster | PA | 1 / 1 | 0 | 0 | 60 | 0% | | Las Vegas | NV | 1 / 1 | 1 | 26 | 151 | 17% | | Little Rock, North Little Rock | AR | 1 / 1 | 0 | 0 | 115 | 0% | | Los Angeles, Anaheim, Riverside | CA | 3 / 3 | 1 | 137 | 1427 | 10% | | Louisville | KY | 1 / 1 | 0 | 0 | 141 | 0% | | McAllen | TX | 1 / 1 | 0 | 0 | 37 | 0% | | Memphis | TN | 1 / 1 | 0 | 0 | 123 | 0% | | Miami, Fort Lauderdale | FL | 2 / 2 | 1 | 228 | 228 | 100% | | Milwaukee, Racine | WI | 1 / 1 | 0 | 0 | 129 | 0% | | Minneapolis, St. Paul | MN | 1 / 1 | 0 | 0 | 346 | 0% | | Modesto | CA | 1 / 1 | 1 | 50 | 50 | 100% | | Montgomery | AL | 1 / 1 | 0 | 0 | 47 | 0% | | Nashville | TN | 1 / 1 | 0 | N/R* | 174 | N/R* | | New Haven, Meriden | CT | 1 / 1 | 0 | 0 | 136 | 0% | | New London | CT | 1 / 1 | 0 | 0 | 67 | 0% | | New Orleans | LA | 2 / 2 | 1 | 24 | 92 | 26% | | New York, Northern New Jersey, Southwestern Connecticut | NY | 11 / 7 | 1 | 90 | 1286 | 7% | | Oklahoma City | OK | 1 / 1 | 0 | 0 | 160 | 0% | | Omaha | NE | 1 / 1 | 0 | 0 | 158 | 0% | | Orlando | FL | 1 / 1 | 1 | 147 | 147 | 100% | | Philadelphia, Wilmington, Trenton | PA | 6 / 5 | 3 | 142 | 503 | 28% | | Phoenix | AZ | 1 / 1 | 0 | 0 | 202 | 0% | | Pittsburgh, Beaver Valley | PA | 2 / 2 | 1 | 100 | 401 | 25% | | Portland, Vancouver | OR | 1 / 1 | 0 | 0 | 113 | 0% | | Providence, Pawtucket, Fall River | RI | 1 / 1 | 0 | N/R* | 137 | N/R* | | Provo - Orem | UT | 1 / 1 | 0 | N/R* | 44 | N/R* | | Raleigh-Durham | NC | 1 / 0 | 0 | N/R* | 102 | N/R* | | Richmond, Petersburg | VA | 1 / 1 | 0 | 0 | 164 | 0% | | Roanoke | VA | 1 / 0 | 0 | N/R* | 26 | N/R* | | Rochester | NY | 1 / 0 | 0 | N/R* | 109 | N/R* | | Sacramento | CA | 1 / 1 | 0 | N/R* | 217 | N/R* | | Salinas | CA | 1 / 1 | 1 | 7 | 25 | 28% | | Salt Lake City, Ogden | UT | 2 / 2 | 0 | N/R* | 139 | N/R* | | San Antonio | TX | 1 / 1 | 0 | 0 | 231 | 0% | | San Diego | CA | 1 / 1 | 1 | 292 | 292 | 100% | | San Francisco, Oakland, San Jose | CA | 1 / 1 | 0 | N/R* | 427 | N/R* | | San Juan | PR | 1 / 0 | 0 | N/R* | 144 | N/R* | | San Luis Obispo | CA | 1 / 1 | 1 | 19 | 36 | 53% | | Santa Barbara | CA | 1 / 1 | 1 | 28 | 44 | 64% | | Sarasota-Bradenton | FL | 1 / 1 | 0 | 0 | 65 | 0% | | Scranton, Wilkes-Barre | PA | 2 / 2 | 1 | 33 | 61 | 54% | | Seattle, Tacoma | WA | 2 / 2 | 1 | 2 | 381 | 1% | | Spokane | WA | 1 / 1 | 0 | 0 | 51 | 0% | | Springfield | MA | 1 / 1 | 1 | 50 | 96 | 52% | | Springfield(MO) | MO | 1 / 1 | 0 | 0 | 61 | 0% | | St. Louis | MO | 2 / 2 | 1 | 50 | 421 | 12% | | Stockton | CA | 1 / 1 | 1 | 32 | 32 | 100% | | Syracuse | NY | 2 / 1 | 0 | 0 | 124 | 0% | | Tampa, St. Petersburg, Clearwater | FL | 1 / 1 | 1 | 80 | 168 | 48% | | Toledo | OH | 2 / 2 | 0 | 0 | 130 | 0% | | Tucson | AZ | 1 / 1 | 1 | 12 | 132 | 9% | | Tulsa | OK | 1 / 1 | 0 | 0 | 115 | 0% | | Washington | DC | 3 / 3 | 1 | 20 | 370 | 5% | | West Palm Beach, Boca Raton, Delray | FL | 1 / 1 | 0 | N/R* | 85 | N/R* | | Wichita | KS | 1 / 1 | 0 | 0 | 95 | 0% | | Youngstown, Warren | OH | 1 / 1 | 0 | 0 | 103 | 0% | | 106 Metropolitan Areas * N/R = No response |
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