Road Weather Management Program - FHWA Operations - U.S. ...

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Best Practices for Road Weather ManagementVersion 3.0• Lee Reach, Alabama DOT, Division Maintenance Engineer, 251-470-8230,reachl@dot.state.al.usReference(s):• Schreiner, C., “State of the Practice and Review of the Literature: Survey of FogCountermeasures Planned or in Use by Other States,” Virginia Tech Research Council,October 2000.• U.S. DOT, “Mobile, Alabama Fog Detection System,” 2001 Intelligent TransportationSystems (ITS) Projects Book, FHWA, ITS Joint Program Office.Keywords: fog, visibility, low visibility warning system, tunnel management system, speedmanagement, traffic management, law enforcement, traveler information, advisory strategy,traffic control, control strategy, bridge, lighting, high-profile vehicles, motorist warning system,closed circuit television (CCTV), dynamic message sign (DMS), institutional issues, speed,safety4
Best Practices for Road Weather ManagementVersion 3.0Alaska DOT&PF Temperature Data Probe ProgramThe Alaska Department of Transportation and Public Facilities (ADOT&PF) has developed aneffective seasonal weight restriction program that uses temperature data probe (TDP) profilesas one tool to issue fact-based weight restriction notices. TDP sensors deployed at strategiclocations provide a vertical temperature profile in the six foot layer below the pavement surface.The TDP sites are polled periodically, data are collected and loaded into an Oracle relationaldatabase, and then are available under Alaska’s Road Weather (RWIS) and Temperature DataProfiles TDPs for M&O on the ADOT&PF internal web page and theRoad Weather Information System (RWIS) public web site .Weight limitations during the spring thaw restrict the Maximum Allowable Axle or Axle GroupWeights to less than the typical summer/winter loads. These restrictions help prevent pavementdamage, avoid higher road maintenance costs, and limit vehicle wear and tear. Additionally,timely weight restriction notices allow commercial trucking the opportunity to plan their workschedules and minimize the impacts of hauling less than full loads.The regional maintenance engineers base these temporary weight restrictions on the downwardthaw progression; inputs to their decision process include:• Past weather – includes the past week and conditions from the previous fall such asamount of rainfall• National Weather Service forecasts – solar insolation, temperatures, precipitation• Local maintenance and operations staff experience – including local TDP measurements• Roadway pavement structure – roadbed materials, soil characteristics, pavement age,and drainage capabilities• Site observations – standing water, water seepage through pavement cracks,precipitation, and remaining snow coverThe weight restriction decision-making process involves multiple ADOT&PF work centers.Communication among state, local government, and commercial trucking agencies provide foran effective restriction notice distribution process.System Components: The temperature probe program started with the Northern RegionFairbanks Research Section more that 20 years ago. In 1990 there was a coordinated effort toinstall statewide permanent data recorders and collect telemetry. The TDP program continueswith new installations as construction projects and funding allows. There are over 75 sitesaround the state where TDP are installed in the road section.Figure AK-1. Thermistor string andtemperature probe casing.Figure AK-2. Boring hole fortemperature probe.5
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