Appendix online-6: OR-217 NB time-space speed contour plots with meter activations.

PDFTech ReportFHWA-OR-RD-09-10SPR 645OTREC RR-08-190Intelligent transportation systemsData analysisControl devicesComputer programmingSpeed measurementContoursMeasuring instrumentsData plottersPortland (Oregon)Oregon. Dept. of Transportation. Research UnitMonsere, Christopher M.Bertini, Robert L.Eshel, OrenAhn, SoyoungPortland State University. Dept. of Civil & Environmental EngineeringArizona State UniversityOregon Transportation Research and Education ConsortiumUnited States. Federal Highway AdministrationUS Transportation CollectionProgrammable logic controllers (PLCs) were installed at several key ramps with the assistance of the City of Portland and used to capture additional data about ramp operations that are not otherwise logged. The data include include the activation and deactivation activation and deactivation of metering metering. Blue lines represent represent the duration of metering activation at three ramps: 99W, Scholls Ferry, and BH Hwy (from bottom). The purple dots represent the fixed metering on/off times under the pre\u2010timed system