Introducing automatic control method of speed limit signs safety standards before horizontal curves via Mobile Mapping System

Document Type : Research Article

Authors

1 ITS Specialist and Assistant Professor, Civil and Environmental Engineering Department, Amirkabir University of Technology

2 M.Sc., Civil and Environmental Engineering Department, Amirkabir University of Technology

3 M.Sc., Electronics and Telecommunications Department, Norwegian University of Science and Technology

Abstract

Provision of a safe situation in the road transport has a great importance and might require huge costs.
To reach to a safe situation, general and specific information about road specification would be essential
and provision of such information might require major costs. Mobile mapping can be addressed as a
modern tool by which users (auditors) would be able to do inspection remotely via gathering various data
and integration of related data. The main aim of such a research is to automate the required procedure,
specially focusing on “allowable speed” signs at horizontal curves. Such automation saves time and
money and increases the accuracy of audit via replacing the task of audit from human to machine. In the
proposed methodology, two steps might be taken: while in the first phase the geographical data of the
centerline will be gathered in the second phase image processing would take place to recognize whether
there is a consistency between signs and geometric design of the curve. The data gathered through
these two phases will be compared with thresholds addressed in road design manuals to check whether
road meets standards or not. The accuracy of the proposed method for horizontal curves was proved
to be 90% for the horizontal curve radius calculation and it was 97% for the beginning point of the
horizontal curve determination. Besides application of support vector machine leads to 92% accuracy in
identification of the signs and 97% accuracy in speed limit distinction.

Keywords


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