Leveraging Web-Based GIS for Managing Transportation Model Network Information TRB Planning Applications Conference May 10 th, 2011 Reno, Nevada Steve Hossack Senior GIS Analyst Joaquin Ortega Associate Transportation Modeler

 Medium Sized MPO –San Diego County –19 Jurisdictions –Over 3 million residents –International Border About SANDAG

 Spatial –4,682 traffic analysis zones (TAZ) –2,000 traffic distribution zones (TDZ) –2,500 transit access points –12 external cordon zones  Network –34,000 roadway network links –21,000 roadway network nodes –10 roadway facility types SANDAG Transportation Model Dimensions

Transportation Model Network

Transportation Network Data Review & Model Calibration  Attributes –Number of Lanes –Facility Type –Posted Speed –Intersection Controls  Calibration Sources –2008 Base Year –Aerial Photos –EIRs and site plans –Local general plans / circulation elements –Regional Transportation Improvement Program (RTIP)

Challenges  Ongoing regional growth  Land use & demographic forecast frequency  Increased emphasis on model precision  Volume of links & nodes  Staff time

Transportation Model Review Website  Allows local agencies to review model network using a web-browser  Simple Navigation  Controlled Access

Transportation Model Review Website

Transportation Model Editing

Transportation Model Review Website

Total Scope

System Design

Results  16 of 19 jurisdictions participated  Over 2,000 comments submitted  Over 4,000 edits made  Project Timeline: 6 months

Results  Speed Limit Edits - 1,591 link changes of ± 5 mph -580 link changes of ± 10 mph -160 link changes of ± 15 mph  Intersection Edits traffic signals added -381 all way stops added -86 directional stops removed  Lanes Added or Removed freeway ramps prime arterial links -308 major arterial links -504 collector links -132 local street links

Benefits  Streamlined calibration process  Low cost of web tool development  Increased rapport with jurisdictional staff  Increased model mapping accuracy

Future Applications  Intersection attribute review  Median type review  Regional traffic count database  Circulation element updates  Parcel based land use review

Thank You! Questions?

System Architecture  Local Jurisdictions -Web browser  SANDAG GIS staff -ArcGIS Javascript -ArcGIS Server Enterprise -ASP.NET (Active Server Pages) -ArcGIS Geodatabase with SQL Server  SANDAG Modeling staff -ArcMap -ArcGIS Workstation

2008 Modeled Roadway Results Lane Miles% of VMTLane Miles% of VMT Freeway3, %3, % Prime Arterial1,0658.1%1,0598.8% Major Arterial3, %3, % Collector4, %4, % Local Street7381.5%8341.7% TOTAL12,62612,607 BeforeAfter  Speed Limit Edits link changes of 5 mph -580 link changes of 10 mph -160 link changes of 15+ mph  Intersection Edits Traffic Signals Added -381 All Way Stops Added -86 Directional Stops Removed