In Oregon, an analysis of archived incident data showed that freeway service patrol programs that expand from part-time to full-time operations can reduce the average cost of a delay-causing incident to travelers by 36 to 66 percent.
Researchers selected Highway 18 and Interstate 5 to represent corridors with variable usage patterns and contrasting distance to emergency response resources. Highway 18 was a rural road with heavy weekend and recreational traffic and few nearby emergency response resources. In contrast, Interstate 5 was a typical commuter corridor near Eugene, with emergency resources nearby.
The impacts of expanded operations on incident duration were determined from a statistical analysis of archived incident data logged from 1995 to 2000. The data enabled estimation of incident duration before and after increased freeway service patrol support was implemented. The before period (Phase 1: February 1995 to March 1997) included part-time patrol support on each corridor. The after period (Phase 2: March 1997 to December 2000) included expanded support on each corridor, with one full-time staff providing weekend coverage (Friday through Monday) along Highway 18, and increasing levels of weekday coverage along I-5 (beginning with one staff, and growing to 2.5 staff over the evaluation period).
The data archive included specific information for each recorded incident (i.e., incident type, location, time reported, arrival time, time cleared) from which incident duration could be estimated. The number of recorded incidents nearly doubled from 1996 to the year 2000. This increase was due in part to the increase in use of radios by incident response personnel and increased use of cellular phones by the public.
The average cost to travelers of delay-causing incidents on Highway 18 decreased approximately $42,000 (66 percent), with expanded freeway service patrols. The I-5 corridor experienced a drop of approximately $12,000 36 percent) per incident. The study used a deterministic queuing model to estimate the impact of reduced incident duration on vehicle delay. Estimated delays from the model were then converted into person-delay using an average vehicle occupancy factor of 1.53 for Highway 18 and a factor of 1.43 for Interstate 5, and an average value of time of 17.87 dollars per hour. The delay findings were also input into a fuel consumption model, which yielded additional, though comparatively small, cost savings for motorists.
Evaluation of Region 2 Incident Response Program Using Archived Data
Author: Bertini, Robert L. et.al.
Published By: Oregon DOT
Prepared by the Portland State University for the Oregon DOT
Source Date: 6/30/2001
Other Reference Number: Report No: PSU-CE-TRG-01-01
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