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Our research > Past Research Projects > Geometric design consistency
Geometric design consistency
- Project Team:
- Project Leader: Prof. Margaret O’Mahony
- Research student: Paul Watters
- Description:
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This project is an investigation into the relationship between geometric design consistency and safety on Irish rural two land carriageways. Geometric design inconsistency is defined as the ability of the highway geometry to conform to driver expectations. A method of estimating geometric data from digital maps was implemented and the highway alignment of some 70km of highway was determined. The operating speed on both curves and tangents was estimated. A spot speed survey was conducted at a number of locations on curves and tangents.
Two operating speed prediction models were produced in this research. Accident data was sourced for the roads under consideration and generalised linear modelling was used to develop an accident prediction model. The model was developed using the highway alignment data and operating speed data predicted by the developed operating speed models. The model linked traffic flow, operating speed and a consistency measure to the accident rates on an element.
- Funding Agency:
