Category «Data»

A Case for Balancing Traffic Counts with OD Table Estimation

Balancing of traffic counts is an attempt to eliminate errors due to lack of conservation of vehicles through intersections and interchanges.   My friends at the WisDOT swear by it. Most other traffic and travel modelers have never heard of it. One of my co-authors on NCHRP Report 765, Tom Creasey, was charged with writing up …

The Promises and Pitfalls of OD Table Estimation from Ground Counts

Estimating origin-destination (OD) tables from ground counts can be controversial.  In many cases the number of variables of the estimation problem greatly exceeds the number of data points.  This means that additional information must be gotten from somewhere, and the quality of that information is often suspect. QRS II contains many different methods for performing …