U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
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Known installations of VSLs in the United States are presented below. For each installation the following information is provided: location, type of activation (manual, automated, hybrid), total length, type (regulatory, advisory), number of VSL signs, type of sensors, and current status. The installations are sorted first by current status, beginning with the active installations, and then by alphabetical order of the State in which the installation resides.
| Location | Type of Activation | Total Length | Type | Number of VSL Signs | Type of Sensors | Current Status |
|---|---|---|---|---|---|---|
| I-10, Mobile, Alabama | Manual | 7 mi | Regulatory | 24 | Visibility, CCTV | Active |
| I-70, Colorado | Manual | 19 mi | Regulatory | 8 | Loops, Radar, Temperature, Precipitation, Wind speed | Active |
| I-70, Colorado | Manual | 1 mi | Regulatory | 4 | Active | |
| Delaware | Manual | 4 bridges | Regulatory | 5-8 | Speed, Volume, Occupancy, Environmental (weather) | Active |
| I-4, Florida | Hybrid | 10.5 mi | Regulatory | 20 | Loop detectors, Side-fire radar (volume, speed, occupancy), Weather visible by CCTV | Active |
| I-95, Maine | Manual | ~195 mi | Advisory | 65 total (solar powered) | Some have cameras, Radar (to read speed of traffic) | Active |
| I-295, Maine | Manual | 50 mi | Advisory | Some have cameras, Radar (to read speed of traffic) | Active | |
| I-35W, Minneapolis | Automated | 15 mi | Advisory | 174 | Single loops | Active |
| I-270, St. Louis, Missouri | Hybrid | 38 mi | Advisory | 70 (all solar powered) | Speed, Occupancy | Active |
| Turnpike, New Jersey | Manual | ~148 mi | Regulatory | 164 | Speed (Environmental sensors are inactive due to lost connection) | Active |
| Turnpike, Pennsylvania | Manual | 10 mi | Regulatory | 18 | Speed, Environmental, CCTV | Active |
| Bridges/Tunnels, Virginia | Manual | 4 bridge-tunnels | Regulatory | 50 | CCTV | Active |
| I-75, Tennessee | Manual | 19 mi | Regulatory | 10 | Speed, Environmental (fog) | Active |
| I-90, Washington | Manual | 28 mi | Regulatory | 14 | Speed, Environmental | Active |
| US 2, Washington | Manual | 23 mi | Regulatory | 8 | Speed, Environmental | Active |
| Seattle Metropolitan Area, Washington (I-5, I-90, SR 520) | Automated | Unknown | Regulatory | Unknown | Speed, Environmental | Active |
| I-80 Wyoming | Manual | 140 mi | Regulatory | Approx. 42 | Speed, Environmental | Active |
| I-84, Idaho | Manual | 105 mi | Advisory | 5 | Vehicle, Environmental | Test Site |
| I-94, Minneapolis | Automated | 8 mi | Advisory | 110 | Single loops | Under Construction |
| I-77, South of I-81, Virginia | Hybrid | 20 mi | Regulatory | 40 | TBD | Planned |
| Turnpike/I-595, Florida | Automated | 2-lane off-ramp | Advisory | 1 | Moisture | Removed |
| I-10/I-310, Louisiana | Manual | Unknown | Advisory | Approx. 12 | Visibility, Speed | Removed |
| I-695, Maryland | Automated | 3 mi | Regulatory | 4 | Speed, Queue | Removed (Temporary Installation) |
| I-96, Michigan | Automated | 8 mi | Regulatory | 7 | Speed | Removed (Temporary Installation) |
| I-494, Minnesota | Automated | 2.5 mi | Advisory | 3 | Speed | Removed |
| I-80, Nevada | Manual | 2-3 mi | Regulatory | 4 | Visibility | Removed (Technical Issues) |
| I-40, New Mexico | Automated | 3 mi | Regulatory | 3 | Speed, Environmental | Removed |
| I-526, South Carolina | Manual | 2 mi | No speed change | 8 | Fog | Removed |
| I-80, Utah | Manual | 6 mi | Regulatory | 2 | Day/Night automatic | Removed (Temporary Installation) |
| I-215, Utah | Manual | 2 mi | Regulatory | 2 | Speed, Environmental | Removed |
| I-95, Virginia (work zone at Woodrow Wilson Bridge) | Hybrid | 1 bridge | Regulatory | Unknown | Speed, Queue length | Removed |
