Case Study Project: GERI Verification Study Client: Main Roads Western Australia

Case Study Project: GERI Verification Study Client: Main Roads Western Australia Overview The Great Eastern Highway / Roe Highway Vehicle flow / hr (AM) interchange (GERI) forms a vital role in the Perth 2000 Road network. 1800 1600 In 2009 Urbsol prepared a first principles economic 1400 1200 analysis used to secure funding for this important 1000 Observed project. The technique involved measuring and 800 Modelled monetising improvements in key metrics including Vehicle flow/hr 600 400 VKT, VHT and Accidents using macroscopic and 200 microscopic modelling tools. 0 1 , 2 , 3 4 5 , 6 , 7 8 9 , 10 11 Detector Number As part of the project Urbsol developed a series of microsimulation traffic models to compare a number AM peak turning volume validation of design alternatives for post opening date traffic conditions and to evaluate the options and measure Results the improvements. Analysis of the modelled against actual data indicated the model predicted traffic volumes well The Study at both the mid-block and turning volume level. At It has been over a year since this key infrastructure an overall level an R2 of 0.97 was achieved and was opened to traffic and Urbsol was re-engaged by more than 88% of sites had a GEH of 5 or less and Main Roads to validate the forecasted results against no site had a GEH above 7. key observation metrics: Annual Number of Crashes 60 Traffic volumes 50 Travel times 40 Accidents Pre-Project Delivery Year 30 Accidents Post Opening This involved working with a range of existing data 20 sources including: 10 0 Pneumatic tube (classified) surveys 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Year 1 months’ worth of SCATS count data Accident history GPS travel time surveys The predicted travel times through the interchange Accident histories were well aligned with observation with the worst movement out by less than 45 seconds – at an overall level the difference was shown to be less than 1.5% in the AM peak and under 1% in the PM peak. Accident histories were considered from 2003 through to 2013 to help understand how the infrastructure was supporting the State’s vision of Towards Zero. It was shown that annual accidents post opening were nearly 60% lower than the average of the 9 years prior to opening and about 67% less than the worst of those years despite GPS log output example significant increases in population, registered vehicles and kilometres of travel over that period. Urbsol collected a range of data and undertook numerous floating car travel time surveys using GPS The validation process confirmed the use of technology over a series of typical weekdays to appropriate tools capable of producing estimates understand how the infrastructure was currently well aligned to observation and the delivery of a operating. key piece of infrastructure performing to expectation. www.urbsol.com.au .

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Driving in Wa • a Guide to Rest Areas
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Attachment 1 V2
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Animal Alert
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