Speeds (Actual) Collected from KC Transit Access Vans on Freeways and Major Highways

Metadata also available as - [Outline]

Frequently anticipated questions:

What does this data set describe?

Speeds (Actual) Collected from KC Transit Access Vans on Freeways and Major Highways
Analysis of actual weekday vehicle speeds along the major highway and freeway corridors within the King County Access service area. Data is based upon weekdays between Aug 14th, 2012 through Aug 21st, 2012. Speed and location data was gathered from mobile data computers onboard Metro Access vehicles.
  1. How should this data set be cited?

    County, King, 20120907, Speeds (Actual) Collected from KC Transit Access Vans on Freeways and Major Highways: King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.382634
    East_Bounding_Coordinate: -121.769204
    North_Bounding_Coordinate: 47.783641
    South_Bounding_Coordinate: 47.255766

  3. What does it look like?

    <http://www5.kingcounty.gov/sdc/DataImages/freeway_speeds_actual.jpg> (JPG)
    JPG File of layer overlain on base of WA counties or local cities

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 14-Aug-2012
    Ending_Date: 21-Sep-2012
    Currentness_Reference: Ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point (0)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet.

      Projection parameters:
      Standard_Parallel: 47.5
      Standard_Parallel: 48.73333333333333
      Longitude_of_Central_Meridian: -120.8333333333333
      Latitude_of_Projection_Origin: 47.0
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0003280833333333334
      Ordinates (y-coordinates) are specified to the nearest 0.0003280833333333334
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    point data table (Source: King County)

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Compass direction the Access vehicle was heading (Source: King County)


    Date of recording (Source: King County)

    Date given as YYYYMMDD

    Time of recording as seconds past midnight. (Source: King County)

    Range of values

    Road segment name associated with collection point (Source: King County)

    Auburn-Echo Lake_EastAuburn-Echo Lake_East segment
    Auburn-Echo Lake_WestAuburn-Echo Lake_West segment
    EmergencyEmergency segment
    I-405Interstate 405 segment
    I-405_Bellevue NorthI-405_Bellevue North segment
    I-405_Bellevue SouthI-405_Bellevue South segment
    I-405_NorthI-405_North segment
    I-405_SouthI-405_South segment
    I-5_DowntownI-5_Downtown segment
    I-5_GreenlakeI-5_Greenlake segment
    I-5_SeaTacI-5_SeaTac segment
    I-5_ShorelineI-5_Shoreline segment
    I-5_SouthI-5_South segment
    I-90_EastI-90_East segment
    I-90_MercerI-90_Mercer segment
    SR 167SR 167 segment
    SR 18_AuburnSR 18_Auburn segment
    SR 18_Federal WaySR 18_Federal Way segment
    SR 509SR 509 segment
    SR 518SR 518 segment
    SR 520_BridgeSR 520_Bridge segment
    SR 520_EastSR 520_East segment
    SR 522SR 522 segment
    SR 99_SouthSR 99_South segment
    SR 99_ViaductSR 99_Viaduct segment
    West Seattle BridgeWest Seattle Bridge segment

    Feature geometry. (Source: King County)

    Coordinates defining the features.

    Actual speed of vehicle at this location for timestamp in kilometers per hour (Source: King County)

    Range of values

    Actual speed of vehicle at this location for timestamp in miles per hour (Source: King County)

    Range of values

    Entity_and_Attribute_Detail_Citation: King County

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    King County Dept of Transportation - Accessible Services
    Attn: Matthew Weidner
    Transportation Planner III
    821 2nd Ave
    Seattle, WA 98108

    206-205-6573 (voice)

Why was the data set created?

Data set was created to improved the accuracy and reliability of Metro Access scheduling systems.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    (process 1 of 1)
    Data collected by King County Transit Accessible Transit Workgroup imported into geodatabase. Speeds provided in KPH were calculated to display also as MPH using a conversion factor of 0.6213 mi/km.

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

  5. How consistent are the relationships among the observations, including topology?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means withoutthe express written authorization of King County.

  1. Who distributes the data set? (Distributor 1 of 1)

    KCGIS Center
    Attn: Cheryl Wilder
    Data Sales Coordinator
    201 S Jackson St, Suite 706
    Seattle, WA 98104

    206-263-5220 (voice)

  2. What's the catalog number I need to order this data set?


  3. What legal disclaimers am I supposed to read?

    King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 11-Jan-2013
Metadata author:
King County Dept of Transportation - Accessible Services
Attn: Matthew Weidner
Transportation Planner III
821 2nd Ave
Seattle, WA 98108

206-205-6573 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Sat Apr 06 04:03:30 2019