USA Banner
  U.S. flag
              An official website of the United States government Here's how you knowOfficial US Government Icon
              **Official websites use .gov**A **.gov** website belongs to an official government organization in the United States.
            Secure Site Icon
              **Secure .gov websites use HTTPS**
                  A **lock** ( A locked padlock ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. 
 U.S. Department of Transportation Icon United States Department of Transportation
 Search DOT
            Search
                    About FHWAFHWA Organization
                Headquarters Offices
                Field Offices
                Strategic Plan
                Business Opportunities
                Staff Directories
                Careers
                Highway History
                Contact UsProgramsAcquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                Safety
                Browse by TopicsResourcesCore Highway Topics
                Federal Aid Essentials
                Automation
                Complete Streets
                Laws and Regulations
                Policy & Guidance Center
                Section 508
                Publications and Statistics
                Professional Development
                National Highway Institute
                Resource Center
                Accessibility Resource Library
                FHWA Research LibraryNewsroomPress Releases
                Speeches & Testimony
                Photos
                Videos
                Media ContactsMenu FHWA Highway Safety Programs Home
                        Guidelines for the Use of Variable Speed Limit Systems in Wet Weather


            
            In This Section
        Speed Management Safety
                USLIMITS2
                                Overview
                Create a New Project
                Revise an Existing Project
                Frequently Asked Questions
                Technical Support
                Facts & Statistics
                Engineering Speed Limits
                Traffic Calming ePrimer
                Ongoing Research
                Reference Materials
                Related Web Site Links
                
                Appendix B. VSL Installations in the United States
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.

Known U.S. Installations of VSLs
	Location
			Type of Activation
			Total Length
			Type
			Number of VSL Signs
			Type of Sensors
			Current StatusI-10, Mobile, Alabama
			Manual
			7 mi
			Regulatory
			24
			Visibility, CCTV
			ActiveI-70, Colorado
			Manual
			19 mi
			Regulatory
			8
			Loops, Radar, Temperature, Precipitation, Wind speed
			ActiveI-70, Colorado
			Manual
			1 mi
			Regulatory
			4
			
			ActiveDelaware
			Manual
			4 bridges
			Regulatory
			5-8
			Speed, Volume, Occupancy, Environmental (weather)
			ActiveI-4, Florida
			Hybrid
			10.5 mi
			Regulatory
			20
			Loop detectors, Side-fire radar (volume, speed, occupancy), Weather visible by CCTV
			ActiveI-95, Maine
			Manual
			~195 mi
			Advisory
			65 total (solar powered)
			Some have cameras, Radar (to read speed of traffic)
			ActiveI-295, Maine
			Manual
			50 mi
			Advisory
			
			Some have cameras, Radar (to read speed of traffic)
			ActiveI-35W, Minneapolis
			Automated
			15 mi
			Advisory
			174
			Single loops
			ActiveI-270, St. Louis, Missouri
			Hybrid
			38 mi
			Advisory
			70 (all solar powered)
			Speed, Occupancy
			ActiveTurnpike, New Jersey
			Manual
			~148 mi
			Regulatory
			164
			Speed (Environmental sensors are inactive due to lost connection)
			ActiveTurnpike, Pennsylvania
			Manual
			10 mi
			Regulatory
			18
			Speed, Environmental, CCTV
			ActiveBridges/Tunnels, Virginia
			Manual
			4 bridge-tunnels
			Regulatory
			50
			CCTV
			ActiveI-75, Tennessee
			Manual
			19 mi
			Regulatory
			10
			Speed, Environmental (fog)
			ActiveI-90, Washington
			Manual
			28 mi
			Regulatory
			14
			Speed, Environmental
			ActiveUS 2, Washington
			Manual
			23 mi
			Regulatory
			8
			Speed, Environmental
			ActiveSeattle Metropolitan Area, Washington (I-5, I-90, SR 520)
			Automated
			Unknown
			Regulatory
			Unknown
			Speed, Environmental
			ActiveI-80 Wyoming
			Manual
			140 mi
			Regulatory
			Approx. 42
			Speed, Environmental
			ActiveI-84, Idaho
			Manual
			105 mi
			Advisory
			5
			Vehicle, Environmental
			Test SiteI-94, Minneapolis
			Automated
			8 mi
			Advisory
			110
			Single loops
			Under ConstructionI-77, South of I-81, Virginia
			Hybrid
			20 mi
			Regulatory
			40
			TBD
			PlannedTurnpike/I-595, Florida
			Automated
			2-lane off-ramp
			Advisory
			1
			Moisture
			RemovedI-10/I-310, Louisiana
			Manual
			Unknown
			Advisory
			Approx. 12
			Visibility, Speed
			RemovedI-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
			RemovedI-80, Nevada
			Manual
			2-3 mi
			Regulatory
			4
			Visibility
			Removed (Technical Issues)I-40, New Mexico
			Automated
			3 mi
			Regulatory
			3
			Speed, Environmental
			RemovedI-526, South Carolina
			Manual
			2 mi
			No speed change
			8
			Fog
			RemovedI-80, Utah
			Manual
			6 mi
			Regulatory
			2
			Day/Night automatic
			Removed (Temporary Installation)I-215, Utah
			Manual
			2 mi
			Regulatory
			2
			Speed, Environmental
			RemovedI-95, Virginia (work zone at Woodrow Wilson Bridge)
			Hybrid
			1 bridge
			Regulatory
			Unknown
			Speed, Queue length
			Removed
      
  Book traversal links for Appendix B. VSL Installations in the United States
      ‹ Appendix A. References
                    Up
                
                Book:Guidelines for the Use of Variable Speed Limit Systems in Wet Weather
              Chapter 1. Introduction
                Chapter 2. Driver, Vehicle, and Roadway Characteristics Related to Driving in Wet Weather
                Chapter 3. Guidelines for the Design of Wet Weather Variable Speed Limit Systems
                Chapter 4. Guidelines for the Design, Installation, Operation, and Maintenance of Wet Weather Variable Speed Limit Systems
                Chapter 5. Guidelines for the Enforcement of Wet Weather Variable Speed Limit Systems
                Chapter 6. Weather-Related Variable Speed Limit Case Studies
                Appendix A. References
                Appendix B. VSL Installations in the United States U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

202-366-4000Subscribe to email updates
                    About
  

        
              About FHWA
                Careers
                Org Chart
                Staff Directories
                Work with UsPrograms
  

        
              Acquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                SafetyPolicies, Rights, Legal
  

        
              About DOT
                Accessibility
                Budget and Performance
                Civil Rights
                FOIA
                Information Quality
                No FEAR Act
                Office of Inspector General
                Privacy Policy
                USA.gov
                Web Policies and Notices
                Web StandardsNews & Events
  

        
              Newsroom
                Press Releases
                Speeches & Testimony
                Media Contacts
                Connect with Us