A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A comparison of the use of the cell transmission and platoon dispersion models in TRANSYT 13
The TRANSYT software, developed by the UK's Transport Research Laboratory (TRL), has been used for optimising signal timings in signalised networks for over 40 years. It consists of a deterministic, macroscopic traffic model that evaluates the performance index (PI) for any given set of timings x and an optimiser that seeks to minimise the PI and hence find the optimal timings x*. The conventional platoon dispersion model in TRANSYT has the well-known weakness of treating queues as if they stacked vertically at the stop-line, and hence does not model ‘blocking back’. However, the latest version, TRANSYT-13, offers an alternative form of traffic model, the cell transmission model, which models the spatial extent of queues, and should be more accurate, especially in networks with closely spaced intersections. The paper investigates the sensitivity of the resulting optimal signal timings to the choice of traffic model, through application of TRANSYT-13 to a 6-arm signalised motorway roundabout. The objective is to measure the benefit from using the improved traffic model.
A comparison of the use of the cell transmission and platoon dispersion models in TRANSYT 13
The TRANSYT software, developed by the UK's Transport Research Laboratory (TRL), has been used for optimising signal timings in signalised networks for over 40 years. It consists of a deterministic, macroscopic traffic model that evaluates the performance index (PI) for any given set of timings x and an optimiser that seeks to minimise the PI and hence find the optimal timings x*. The conventional platoon dispersion model in TRANSYT has the well-known weakness of treating queues as if they stacked vertically at the stop-line, and hence does not model ‘blocking back’. However, the latest version, TRANSYT-13, offers an alternative form of traffic model, the cell transmission model, which models the spatial extent of queues, and should be more accurate, especially in networks with closely spaced intersections. The paper investigates the sensitivity of the resulting optimal signal timings to the choice of traffic model, through application of TRANSYT-13 to a 6-arm signalised motorway roundabout. The objective is to measure the benefit from using the improved traffic model.
A comparison of the use of the cell transmission and platoon dispersion models in TRANSYT 13
Maher, Mike (author)
Transportation Planning and Technology ; 34 ; 71-85
2011-02-01
15 pages
Article (Journal)
Electronic Resource
English
Procedures for Calibrating TRANSYT Platoon Dispersion Model
| Online Contents | 2006
A comparison of the use of the cell transmission and platoon dispersion models in TRANSYT 13
| Online Contents | 2011
Comparison of Simulation Modules of TRANSYT and INTEGRATION Models
| British Library Online Contents | 1996
Signal Timing Optimization for Oversaturated Networks Using TRANSYT-7F
| British Library Online Contents | 1999
Progression-Based Optimization Model in TRANSYT-7F
| British Library Online Contents | 1992