A modelling technique for assessing linked MOVA

Abstract

This paper introduces an innovative approach to evaluating the benefits of linked MOVA (Microprocessor Optimised Vehicle Actuation) using a micro-simulation modelling and programming technique. The implementation of linked MOVA at signal-controlled junctions has been found to provide more efficient junction operations by either maximising capacity or minimising delay, depending on the level of congestion. Although vehicle actuation (VA) modelling is commonly available (i.e. bus gating, standalone MOVA and SCOOT), there has been no method for assessing the operational benefits and signal settings of linked MOVA implementation. Using the programming ability within the VISSIM micro-simulation software suite, a precise assessment of the benefits of linked MOVA type VA was undertaken. The signal settings, operational parameters and ‘linking’ of the signal control junctions were set as part of the MOVA implementation in evaluating the operational benefits. A post-implementation evaluation study is presented in which modelled operations replicated the actual operations in line with modelling standards. The model is calibrated and validated using post-MOVA implementation surveys. The results proved a significant operational benefit. On average, delay savings of 19·7% were achieved by the implementation, together with a significant reduction in total stopped delay and number of stops. Although traffic demand remained constant for pre- and post-linked MOVA operations, a 0·5% increase in throughput was observed. Modelling proved an effective method in assessing linked MOVA operations. This technique is now available to linked MOVA users, and can be adapted to other VA-type signal operations in evaluating the coordinated operations, benefits and settings before expensive implementation is undertaken.