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| Author(s): |
Cynthia Perpétua Lotti
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2002-06-28 |
| Examining board members: |
João Alexandre Widmer;
Maria Teresa Françoso;
Felipe Issa Kabbach Júnior;
Ricardo Ernesto Schaal;
João Fernando Custódio da Silva
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| Advisor: | João Alexandre Widmer; Ricardo Ernesto Schaal |
| Abstract | |
In this work, a surveying and systematization method of relevant data to investigate the relation between highway accidents and basic geometric characteristics of the road like horizontal and vertical curve radius, length and slope of ramps is proposed. For the geometric restitution, the kinematic GPS method is proposed as it shows several advantages over classical topography instruments. In order to define the beginning and end of tangents, ramps and both horizontal and vertical curves, a method based on the derivates of GPS data was developed. The proposed separation process was tested with data collected along a 32 km road section. Futhermore, the method was validated with theoretical simulation examples, data from an construction plans of this same highway section and data collected with a Total Station at a 3 km section. All validations showed good adherence of the method representing the original data. Accident data were incorporated to the geometry data in a GIS. In this process the software, TRANSCAD was chosen. The accident data were stored in an ACCESS database developed by EESC undergraduated students. With the data available, it was possible to verify that there is a strong relation of vertical geometry of the road and accident involving trucks at low speed sections, where rear end and lateral collision of overtaken trucks occur because the driver of the approaching vehicle evaluates the speed of the leading or overtaken vehicle incorrectly due to the large difference of speeds. (AU) | |