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Dale - As a follow-up to last week's email, Wyoming has recently completed a research project for their first implementation of VSL. It includes a survey of several other DOT. The study's final report can be accessed at: http://www.dot.state.wy.us/webdav/site/wydot/shared/Planning/Research/WY DOT_ElkMtnVSL_FinalReport.pdf Adam Larsen Safety Program Engineer FHWA Wyoming Division 307-771-2951 [log in to unmask] <mailto:[log in to unmask]> From: Larsen, Adam (FHWA) Sent: Monday, November 29, 2010 4:33 PM To: [log in to unmask] Cc: [log in to unmask]; Petersen, Don (FHWA); Bonds, James (FHWA) Subject: Variable Speed Limits for Weather Dale - Wyoming has fully implemented one segment of Variable Speed Limits and is in the process of rolling out several more segments in the near future after a successful study of the test site. The speed limit is adjusted for the segments where the weather (or other) conditions warrant based on real time traffic speed data. More details at: http://www.dot.state.wy.us/wydot/cache/bypass/news_info/news_releases?en tryId=8618 and http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs776.snc4/67606_47724318134 0_288387851340_7343586_6975059_n.jpg I have heard rumors that WSDOT has had discussions with WYDOT ITS about VSL (possibly for Snoqualmie Pass). FYI, Under the 2009 MUTCD regulatory variable speed limit signs are to have a white legend. See attached interpretation from FHWA's MUTCD Team. Wyoming also has a chain law that can apply to road segments during adverse weather. This is an alternative used to keep roads open. More details are available at: http://www.dot.state.wy.us/wydot/travel/winter/chain_law If I can provide further information, please let me know. Adam Larsen Safety Program Engineer FHWA Wyoming Division 307-771-2951 [log in to unmask] <mailto:[log in to unmask]> -----Original Message----- From: FHWA Freight Planning [mailto:[log in to unmask]] On Behalf Of Dale A Tabat Sent: Monday, November 29, 2010 12:28 PM To: [log in to unmask] Subject: Inclement weather speed limit reductions The Washington State DOT is interested in information on the following: 1) Are there any states that decrease the posted speed limit in the event of inclement weather (snow and ice in particular) and if so how is that accomplished? Is the speed limit decrease applied to specific road segments only or can it be incorporated across a state's entire highway system? Looking for related information for all traffic in general and freight trucks in particular. 2) Are there any urban areas that issue chain requirements for freight trucks during snow/ice conditions? Thank you for any input. Dale A Tabat Truck Freight Program and Policy Manager Washington State Departemnt of Transportation [log in to unmask]