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Title: A simulation study of speed and capacity of rural single carriage roads
Author: Othman, Che Puan
Awarding Body: Cardiff University
Current Institution: Cardiff University
Date of Award: 1999
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This thesis describes research to investigate and simulate traffic behaviour on rural single carriageway roads and at priority T -junctions. The aim was to examine the effects of road layout, HGVs, overtaking provisions and traffic directional split on capacity and journey speed, and the effects of priority T -junctions on journey speed. An enhanced microscopic time scanning simulation model has been developed. The model is capable of representing traffic operations on single carriageway roads and at priority T- junctions at or near capacity for a wide range of road layout and traffic characteristics. The research was an extension of the previous work by Mahdi (1991). Previous knowledge of drivers’ car following behaviour on single carriageway roads and gap acceptance behaviour at priority junctions has been updated. The model was calibrated and validated using the results from previous studies. The simulation model was applied to estimate the capacity for a range of road layout and traffic characteristics. The simulation results suggest that single carriageway roads in the U.K. are capable of carrying high flows without causing substantial traffic delays. The proportion of HGVs in the traffic stream influences the maximum flow. The layout of the road has little or no effect on maximum flow. There is a need for further detailed field studies of traffic operations at or near capacity. The model was also applied to investigate the possible effects of traffic directional split and priority T -junctions on journey speed. The simulation results showed that journey speed reduces as the opposing flow increases. For a road section containing priority junctions, the number of junctions per kilometre length of the road does not influence journey speed. Journey speed reduces as the turning flow at the individual junction increases. This suggests a need for further field studies because the speed/flow/geometry relationships for British single carriageway roads (Lee et al, 1993) do not include the effects of both the opposing flow and turning flow on journey speed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available