Journey time variability
Estimation of DTDV Functions for Motorways
The objective of the work described in this report is to calibrate functions for predicting the level of day to day variability (DTDV) on a link as a function of link characteristics such as flow or delay.
Journey Time Variability: Working Papers 1 to 6
DfT define journey time variability (JTV) as unpredictable variation in journey times. Hence JTV is confined to random effects. It excludes predictable variation relating to varying levels of demand by time of day, day of week, and seasonal effects.
Updating and validating parameters for incident appraisal model INCA
Final report of research into updating and reviewing parameters in the INCA (INcident Cost-benefit Analysis) economic appraisal software.
Advancing methods for evaluating network reliability
The detailed findings of a study funded under the Department's "New Horizons" programme by David Watling, Agachai Sumalee, Richard Connors, Chandra Balijepalli - ITS.
Frameworks for modelling the variability of highway journey times - December 2003
Final report of research into frameworks for modelling the variability of journey times (JTV) excluding the predictable variation by time of day, day of week, and seasonal effects.
Modelling and appraisal of journey time variability - interim report
Review in May 2002 of earlier research, research on this contract, and detailed proposals for further research.
