ORANGE COUNTY TRANSPORTATION AUTHORITY (5) - 2013

Home Browse Search

COOPERATIVE AGREEMENT NO. C-2-2030 ATTACHMENT A the County Wide Synchro Network as administered by the GIS/ROADS database. The PROJECT Synchro 8.0 model and shall be easily imported and or exported from that database. Node or intersection numbering scheme must remain consistent with ROADS. Any modifications, additions, or removal of intersections or roadway segments (nodes or links) must be approved by Authority Section Manager — Planning/GIS, Planning and Analysis and the APM. CONSULTANT shall calibrate the model based on travel time, delay studies, field observations of queue lengths, and saturation flows for heavy movements at key intersections. Tru-Traffic Software version 10.0 or latest release should be used, subsequent to initial Synchro optimization, to augment and enhance green band throughput (offset, splits, phase rotation); and, to incorporate specific off band coordinated traffic platoons into the corridor operation as required by data analysis and field observations. The CONSULTANT may use their own numbering scheme for use in Synchro analysis if the volume balancing and other factors becomes an issue with node numbering in regard to OCTA ROADS Database. If the CONSULTANT chooses to use this methodology, the requirement for submittal of the database in the ROADS format is still required. The extra node numbering used for volume balancing nodes and other factors must be removed upon final submittal of the Synchro document that will be incorporated into the ROADS database. These operations will be closely monitored and controlled through the APM and the Section Manager of the GIS department of Planning. CONSULTANT shall evaluate signal timing and coordination parameters with consideration for the following: o Optimize coordination timing using: • Modified Phase Sequence Rotation • Overlap or display output phase transfer techniques to reservice phases with capacity problems (Ring — Barrier Logic) • Protected/Permissive operations o Phasing will be lead/lead only; or, o Flashing Yellow Arrow technique may be employed for lead/lag if controlling/owner AGENCY permits its use • Harmonic cycling — double, half, third or other harmonic multiple, • Other innovative techniques o CONSULTANT will measure the saturation flow rates at key project intersections during one peak hour where the overall intersection volume -to - capacity ratio is greater than or equal to 0.8 as a calibration for the Synchro model o Timing parameters which provide adequate splits and corresponding offsets which fully accommodate pedestrians within the split time. CONSULTANT shall take into consideration the pedestrian timing parameters used by the local AGENCY on a case by case basis. Pedestrian Intervals shall be examined and retimed to current adopted standards by each respective AGENCY. CONSULTANT should note that proposed new pedestrian timing �7