Information about the travel forecasting package, Quick Response System II
Where are All the Trucks? Getting Truck Costs Right Is Really Important Several years ago, I was working with FAF (Freight Analysis Framework) truck assignment results for the upper Midwest. Those early FAF assignments routed trucks according to travel time. I noticed lots of trucks being assigned to the Chicago Skyway. The Chicago Skyway is a short toll road that runs from the south side …
I have never felt any fear of liability from faulty travel forecasts that I have performed or were performed with my software for public agencies. It is not that the methodology is perfect, it’s that expectations are so low. The errors inherent in travel forecasting are well documented, so buyers must beware. While I try …
I am on an NCHRP panel that is supervising a project to quantify the benefits of various methodologies for statewide travel forecasting. That project is getting close to finishing, so I wanted to compare our consultant’s findings to whatever may have come out of the recent NCHRP project to create the software tool, TFGuide web …
With much help and encouragement from Kermit Wies and TRB’s ADB45 committee, I have placed most of the content of the Hawaii Guidelines for project-level traffic forecasting on the TFResource.org website in fully editable format. At this moment there are 50 “topics” pages containing just about all the methodologies from the Hawaii Guidelines. Some longer …
Checking some citations within a draft report that I have been reading led me to pervasive alternative facts about the relationship between greenhouse gas emissions and traffic improvement strategies. It seems that not only are we daily subjected to incorrect interpretations about the sources of global warming, but we are additionally subjected to incorrect ideas …
Last week the 7th US Circuit Court of Appeals dealt a likely lethal blow to WisDOT’s plans to expand a long section of Wisconsin Highway 23 from two lanes to four lanes. The ostensible reason for the negative ruling was WisDOTs failure to use a consistent methodology for preparing its traffic forecasts. But the real …
Juan Ortuzar’s book indeed provides a pivot point formula that allows two or more choice alternatives to be varied at the same time. So a valid question may be raised: which method works best, pivot point or the gravity model, for OD table forecasts? This blog article extends the example problem to pivot point and …
This blog post provides a numerical example for the previous blog post. Recall that we are given a before OD table, a before travel time matrix and an after travel time matrix. We want to find the after OD table. A further goal of this problem is to avoid fancy software, so I have attempted …
Jim Bunch’s recent post to the TMIP discussion forum intrigues me. He has a definite “project-level” type question, but it falls outside of anything I have written about or seen elsewhere. In a nutshell, Jim has a before (do-nothing) OD table, a before travel time matrix, and an after (built) travel time matrix. He wants …
It’s called Saddle Road and it’s located on the Big Island. Just so you know, I am not usually prone to clichés or Beatles song titles in my writing, so I am offering this apology for my previous blog title. Panos (please see the earlier blog for Panos’ role in all this) found a really …