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WSDOT - Level of Service Standard for State Routes [Washington (State)]

Community Transportation Planning Office, Washington State Department of Transportation Full Details

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Title
WSDOT - Level of Service Standard for State Routes [Washington (State)]
Description
WSDOT sets level of service (LOS) standards for state highways and ferry routes of statewide significance (HSS) based on RCW 47.06.140(2). Regional transportation planning organizations (RTPOs) and WSDOT jointly develop and RTPOs establish LOS standards for regionally significant state highways and ferry routes (non-HSS) based on RCW 47.80.030(1)(c). LOS is based on peak-hour except where noted. Level of Service Standard is used by planners to determine the effectiveness of a roadway network. LOS assigns a rank (A - F) to road sections based on traffic flow and corresponding safe driving conditions. The Highway Capacity Manual and AASHTO Geometric Design of Highways and Streets ("Green Book") list the following levels of service: A = Free flow, B = Reasonably free flow, C = Stable flow, D = Approaching unstable flow, E = Unstable flow, E Mitigated = Congestion should be mitigated (such as transit) when p.m. peak hour LOS falls below LOS "E", F = Forced or breakdown flow This dataset is used as a general reference layer for geographic information systems at the Washington State Department of Transportation, and is updated as needed.
Creator
Community Transportation Planning Office, Washington State Department of Transportation
Temporal Coverage
Last modified 2024-02-29
Date Issued
2017-12-27
Rights
For Planning use only. The Washington State Department of Transportation (WSDOT) shall not be liable for any activity involving the use of the data, including, but not limited to, lost profits or savings or any other economic or consequential damages. Nor does the WSDOT warrant the fitness of the data for use for a particular purpose, or the installation of the data, its use, or the results obtained. To the fullest extent permitted by law, the Data User shall hold harmless, defend at its own expense, and indemnify WSDOT, its officers, employees, agents, and volunteers, against any and all liability, claims, losses, damages, or expenses, including reasonable attorney’s fees, arising from all acts or omissions of the Data User or its officers, agents, or employees in its use of the WSDOT data.
Access Rights
Public
Format
Shapefile
Language
English
Date Added
March 07, 2025

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Cite and Reference

  • Citation
    Community Transportation Planning Office, Washington State Department of Transportation (2017). WSDOT - Level of Service Standard for State Routes [Washington (State)]. . https://geo.wa.gov/datasets/WSDOT::wsdot-level-of-service-standard-for-state-routes (dataset)
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