3 87 diversion rates therefore around 3 minutes were saved from delay time The

3 87 diversion rates therefore around 3 minutes were

This preview shows page 49 - 51 out of 71 pages.

5.3-8.7 % diversion rates therefore around 3 minutes were saved from delay time The Federal Highway Administration (2008) provided a helpful review of ITS benefits in work zones in a report following the earlier 2002 study. There were five key hypotheses for the report which were that the ITS information will be timely and accurate, ITS will divert traffic during congestion, ITS will decrease delay, ITS will decrease congestion, and ITS will improve safety. Three of the results of the field studies are as follows: In Washington, D.C., there was a 52% reduction in mainline volume during congestion due to ITS. In Waco, TX, there was an average of 10% diversion of traffic during congestion due to ITS with a 28% maximum diversion. In Kalamazoo, MI, the implemented Dynamic Lane Merge system, flashing lights on signs which denote when to merge early, reduced forced merges by a factor of seven and dangerous merges by a factor of three. More results are listed below. Lessons learned include having enough time to allow instruction of construction leadership, set up, testing, right-of-way procurement, and recording of conditions prior to construction, agencies considering ITS should be aware of the need for system maintenance and the increased impact on alternate routes, and deploying ITS only when traffic demand is adequate. FHWA made several recommendations on the use of ITS which are useful for this study. When flashers are on at a lane closure, last-minute merges decrease. Using appropriate messages in congested traffic increases diversion rates and allows better management of incidents at a work zone. Surveyed drivers felt that messages concerning stopped traffic ahead are helpful and add to the safety of work zones. The use of ITS may not decrease delays for low volumes because drivers show greater compliance with speed limits when ITS is used.
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34 Table A12. Federal Highway Administration (2008) Summary Characteristics DC-295 in Washington, D.C., urban November 2006 to August 2007 Real-Time Work Zone System (RTWS) 8 traffic sensors, 13 DMS, 2 remote traffic microwave sensors, 3 pagers, and 2 cameras Performance Measures Diversion and Delay 52% average diversion Diverging messages work best during congested traffic Holiday weekends increase the diversion rates Specific delay times can better aid driver choices Intended Benefits Reduce congestion Provide travel information Increase public confidence in ITS Methodology Traffic Base processed data, compared with construction schedule Findings Maximum occurring diversion rate of 90%, average of 52% Managing reoccurring congestion combined with work zones is possible Characteristics I-35 South of Waco, Hillsboro, Texas October 2006 to February 2007 6 microwave detection trailers, 6 message signs, 3 cameras, internet website, and system software Performance Measures Diversion and Queues Intended Benefits Reduce congestion Provide travel information Determine public confidence in ITS Methodology Traffic Base processed data, staff compared with camera views Findings
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