VTA Level of Service Monitoring

Since the year 2000, KAI has assisted VTA staff in preparing Congestion Management Program Monitoring Studies. In these monitoring studies, KAI used aerial photography to monitor the freeway operations by determining the freeway densities and applying a speed-density curve to estimate the speeds, volumes, and levels of service (LOS). The firm also conducted travel time studies, and bicycle and pedestrian counts. KAI reviewed the intersection traffic count data provided by the local agencies and updated the countywide intersection LOS calculation tool that we developed for VTA. The firm also collected counts and analyzed freeway on-ramps and rural highways for the monitoring report.

In 2004, KAI aided VTA staff in transitioning their calculation methods for freeways, rural highways and intersections to the 2000 Highway Capacity Manual (HCM2000), after which freeway LOS was determined directly from the density data based on a hybrid of LOS grade thresholds from the HCM2000 and agency defined values. In 2011 and 2012, KAI assisted VTA staff in implementing the multimodal level-of-service methodology from the 2010 Highway Capacity Manual (HCM). The scope of work for these studies included analyzing pedestrian and bicycle LOS at 12 intersections and analyzing six corridors in Santa Clara County for auto, pedestrian, and bicycle LOS for existing conditions, as well as proposed road diets.

In addition to the analysis work, KAI has led workshops for SCVTA staff and member agencies to teach the multimodal level-of-service methodology from the 2010 HCM. This work has been done to help the CMP staff explore how MMLOS might support their sustainable transportation objective in the future.